Re: REVISED: Experimentation with Athlon and fast_page_copy
Am Samstag, 5. Mai 2001 09:13 schrieben Sie: > > My (very) old Athlon 550 (model 1, stepping 2) show it on my MSI MS-6167 > > (AMD Irongate C4) with your 2.4.4-ac5, now :-( > > Manfred has a good explanation for that. Im hoping it also explains the > VIA problem too > > > I am open for any test fixes... > > Watch this space -> <- ;) > > Alan Sorry for my noise! My problem was NOT fast_page_copy related. It was Justin's aic7xxx 6.1.12 release. His latest 6.1.13 (2.4.4-ac6) fixed it for me. My MSI MS-6167 (AMD Irongate C4) is running very well with APIC (it haven't really have one) and ACPI (latest) enabled. Below are some MMX copy results. Thanks anyway. Dieter BTW Where can I grep the bench with MB/sec output? SunWave1>./athlon Athlon test program $Id: fast.c,v 1.6 2000/09/23 09:05:45 arjan Exp $ clear_page() tests clear_page function 'warm up run'took 17396 cycles per page clear_page function '2.4 non MMX'took 9582 cycles per page clear_page function '2.4 MMX fallback' took 9031 cycles per page clear_page function '2.4 MMX version'took 7905 cycles per page clear_page function 'faster_clear_page' took 8237 cycles per page clear_page function 'even_faster_clear' took 8151 cycles per page copy_page() tests copy_page function 'warm up run' took 12565 cycles per page copy_page function '2.4 non MMX' took 17273 cycles per page copy_page function '2.4 MMX fallback'took 17481 cycles per page copy_page function '2.4 MMX version' took 12507 cycles per page copy_page function 'faster_copy' took 13641 cycles per page copy_page function 'even_faster' took 12707 cycles per page - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: REVISED: Experimentation with Athlon and fast_page_copy
Alan Cox wrote: > > > Trace; c01b956a > > Trace; c01b3fb5 > > Trace; c01b9aca > > Trace; c01b9380 > > Trace; c01b9940 > > Trace; c01bd457 > > Trace; c01b4d2a > > Trace; c01b5010 > > Trace; c01b51ff > > We seem to be several layers into recursive use of the ide driver - which > shouldnt happen. In fact if these are the same interface the second dmatable > build would leave HWIF(drive)->sg_table wrong. > > > Trace; c01866ce <__make_request+4ae/6f0> > > Trace; c01866e6 <__make_request+4c6/6f0> > > Trace; c01b956a > > Trace; c01b3fb5 I think maybe it smells like a configuration problem, I have a pair of ATAPI drives on the second ide which I run with SCSI emulation. I'll see if I can get a better look, with arguments to the calls. Thanks, Tom -- The Daemons lurk and are dumb. -- Emerson - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: REVISED: Experimentation with Athlon and fast_page_copy
> Trace; 037f > Trace; > Trace; > Trace; 0720 Lets ignore the crap above.. > Trace; c01b956a > Trace; c01b3fb5 > Trace; c01b9aca > Trace; c01b9380 > Trace; c01b9940 > Trace; c01bd457 > Trace; c01b4d2a > Trace; c01b5010 > Trace; c01b51ff We seem to be several layers into recursive use of the ide driver - which shouldnt happen. In fact if these are the same interface the second dmatable build would leave HWIF(drive)->sg_table wrong. > Trace; c01866ce <__make_request+4ae/6f0> > Trace; c01866e6 <__make_request+4c6/6f0> > Trace; c01b956a > Trace; c01b3fb5 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: REVISED: Experimentation with Athlon and fast_page_copy
Alan Cox wrote: > > > > IIRC this thread is about boot going catatonic right after unloading > > __initmem. > > Nope. Its about memory corruptions. Your bug sounds very different > > > Earlier, it looks like handle_mm_fault is being triggered from > > fast_clear_page. > > That would be messy. The other way around is sane but not that way Indeed, I was confused. Looks like ide-dma is getting goofy somehow. Here is a decoded trace. Typos are likely. If the problem is not obvious to anyone, I'll switch around my serial console setup to get some better info. Warning (Oops_read): Code line not seen, dumping what data is available Trace; 037f Trace; Trace; Trace; 0720 Trace; c01b956a Trace; c01b3fb5 Trace; c01b9aca Trace; c01b9380 Trace; c01b9940 Trace; c01bd457 Trace; c01b4d2a Trace; c01b5010 Trace; c01b51ff Trace; c01b3430 Trace; c0132e45 <__wait_on_buffer+75/90> Trace; c0134026 Trace; c018665c <__make_request+43c/6f0> Trace; c01866ce <__make_request+4ae/6f0> Trace; c01866e6 <__make_request+4c6/6f0> Trace; c018665c <__make_request+43c/6f0> Trace; c01866ce <__make_request+4ae/6f0> Trace; c01866e6 <__make_request+4c6/6f0> Trace; c01b956a Trace; c01b3fb5 Trace; c01b9aca Trace; c01b9380 Trace; c01b9940 Trace; c01bd457 Trace; c01b4d2a Trace; c01b5010 Trace; c01b51ff Trace; c01b546e Trace; c01134d0 Trace; c012bd2c Trace; c012cbd7 <__alloc_pages+87/300> Trace; c022c12f Trace; c0125f4d Trace; c0125f58 Trace; c022c0ca Trace; c0122b7d Trace; c012bd2c Trace; c0122a15 Trace; c022c0ca Trace; c0222b7d Trace; c0225476 Trace; c02254c3 Trace; c0112ba9 Trace; c01239cf Trace; c0112900 Trace; c0106ddc Trace; c022be20 Trace; c0112900 Trace; c0134026 Trace; c018665c <__make_request+43c/6f0> Trace; c01866ce <__make_request+4ae/6f0> Trace; c01866e6 <__make_request+4c6/6f0> Trace; c01b956a Trace; c01b3fb5 Trace; c01b9aca Trace; c01b9380 Trace; c01b9940 Trace; c01bd457 Trace; c01b4d2a Trace; c01b5010 Trace; c01b51ff Trace; c01b546e Trace; c01134d0 Trace; c012be03 Trace; c0124d05 <__find_get_page+35/80> Trace; c013ae1b Trace; c0125d44 Trace; c013af79 Trace; c0122a15 Trace; c012267d Trace; c0112ba9 Trace; c022d075 Trace; c022f396 Trace; c0106cbf 1 warning issued. Results may not be reliable. Cheers, Tom -- The Daemons lurk and are dumb. -- Emerson - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: REVISED: Experimentation with Athlon and fast_page_copy
> > What still stands out is that exactly _zero_ people have reported the same > > problem with non VIA chipset Athlons. > > Not any more :-( Still the same > IIRC this thread is about boot going catatonic right after unloading > __initmem. Nope. Its about memory corruptions. Your bug sounds very different > Earlier, it looks like handle_mm_fault is being triggered from > fast_clear_page. That would be messy. The other way around is sane but not that way - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: REVISED: Experimentation with Athlon and fast_page_copy
Alan Cox wrote: > > > the memory copy in the fast_page_copy routine. The machine then > > proceeded > > not to stop at my panic, but I got my "normal" oopses. I then had an > > Ok > > > idea and removed all the prefetch instructions from the beginning of the > > routine and tried the resultin kernel. I now have no crashes. > > What could this mean? > > I think it has to mean a hardware problem. I don't think so, reasons below > What still stands out is that exactly _zero_ people have reported the same > problem with non VIA chipset Athlons. Not any more :-( Hi Alan, IIRC this thread is about boot going catatonic right after unloading __initmem. I'm seeing that in 2.4.5-pre1 with Athlon stepping 2, AMD 751, MS-6195 mobo, 128M. The machine is fine with kernels up through 2.4.4-pre3, and still works with them. On that gear, there is no crash. The keyboard and display are alive and SysRq works. I have copied the stack trace for pid=1 and the processor dump. I'm short of time but I have a kind typist electrifying the trace, and I'll try to generate something ksymoops can digest. Here is what a quick eyeballing of System.map shows. The code is at the end of init/main.c:init(). The processor dump shows init() halted in default_idle() from the sequence L6 -> init -> cpu_idle. Trace of pid 1 shows it stuck in D state. The last addresses listed are from filemap_nopage -> do_execve -> do_no_page -> handle_mm_fault -> __pmd_alloc -> rwsem_down_write_failed -> stext_lock -> system_call. That looks fishy. Earlier, it looks like handle_mm_fault is being triggered from fast_clear_page. I'll post the full dump soon as I have it. Btw, above happens with both gcc-2.95.3 and gcc-3.0-[20010423] compiled kernels. Cheers, Tom -- The Daemons lurk and are dumb. -- Emerson - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: REVISED: Experimentation with Athlon and fast_page_copy
In article <[EMAIL PROTECTED]> you wrote: > Arjan - care to unroll the tail 320 bytes of copying from the main loop ? I'll see what I can do to make us not loose too much speed. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: REVISED: Experimentation with Athlon and fast_page_copy
Have non-production via KT133a, will test :) (tyan mobo, 1.33ghz, tulip eth, an idea drive, nothing really exciting, just a fast ath) -j John R Lenton enlightened recipients with the following on 06May2001: > On Sat, May 05, 2001 at 08:20:56AM +0100, Alan Cox wrote: > > Dont panic just yet. Manfred's observation could mean we hit chipset specific > > behaviour on prefetches. > > OK - Please let me know when to start. -- --- heffner at darkness.net Darkness Network Engineering PGP public key available on request My thoughts and opinions represent no one but myself --- - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: REVISED: Experimentation with Athlon and fast_page_copy
On Sat, May 05, 2001 at 08:20:56AM +0100, Alan Cox wrote: > Dont panic just yet. Manfred's observation could mean we hit chipset specific > behaviour on prefetches. OK - Please let me know when to start. -- John Lenton ([EMAIL PROTECTED]) -- Random fortune: BOFH excuse #349: Stray Alpha Particles from memory packaging caused Hard Memory Error on Server. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: REVISED: Experimentation with Athlon and fast_page_copy
Quick note. I *AM* seeing this problem on a Tyan S2390B which has the Via KT133A chipset on it. AMD Athlon 1.33ghz 2x256m DIMMs Linux 2.4.4-ac5 I haven't done the ksymoops conversions yet, but please let me know if you'd like anything else. But basically, it looks exactly like what all the IWILL owners are seeing. Any other tyan S2390B users? thx, -j -- --- heffner at darkness.net Darkness Network Engineering PGP public key available on request My thoughts and opinions represent no one but myself --- - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: REVISED: Experimentation with Athlon and fast_page_copy
> > one of them to a new mb with a non-VIA chipset (Asus A7A266), and it boot= > ed the > > first Athlon kernel I tried (2.4.4). No other changes to .config, same > > processor as before, same memory, same disks, same video, same case, same= > power > > cord, you name it. > > damn. I guess the saving of 200$ on the MSI has probably been > 300$ down the drain :( Dont panic just yet. Manfred's observation could mean we hit chipset specific behaviour on prefetches. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: REVISED: Experimentation with Athlon and fast_page_copy
> My (very) old Athlon 550 (model 1, stepping 2) show it on my MSI MS-6167 (AMD > Irongate C4) with your 2.4.4-ac5, now :-( Manfred has a good explanation for that. Im hoping it also explains the VIA problem too > I am open for any test fixes... Watch this space -> <- ;) Alan - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: REVISED: Experimentation with Athlon and fast_page_copy
On Sat, May 05, 2001 at 12:10:06AM +0600, Bobby D. Bryant wrote: > They do boot PIII kernels reliably for all those variants, though they still > suffer occasional oopses, hangs, or crashes (as discussed in other threads). and as happens with my SMP pIII VIA-based boxed (and I've finally fixed the memory, so I no longer get the oopses, just solid hardware hangs). > However (and here's the part I haven't mentioned before), yesterday I switched > one of them to a new mb with a non-VIA chipset (Asus A7A266), and it booted the > first Athlon kernel I tried (2.4.4). No other changes to .config, same > processor as before, same memory, same disks, same video, same case, same power > cord, you name it. damn. I guess the saving of 200$ on the MSI has probably been 300$ down the drain :( -- John Lenton ([EMAIL PROTECTED]) -- Random fortune: If you treat people right they will treat you right -- 90% of the time. -- Franklin Delano Roosevelt PGP signature
Re: REVISED: Experimentation with Athlon and fast_page_copy
Aaron Tiensivu wrote: > > What still stands out is that exactly _zero_ people have reported the same > > problem with non VIA chipset Athlons. > > This might be grasping at straws [...] This could be (total conjecture) > related somehow to the corruption bugs they are admitting to in > the 686B although they are blaming the SB Live now. Just another data point (the news is in the final paragraph): I recently built two near-twin systems using Athlon 1.2's and VIA chipsets (EPoX 8KTA3), and have *never* been able to get either to boot an Athlon-optimized kernel, having tried 2.4.0, 2.4.2, 2.4.4, and about 5 different -ac* variants of 2.4.3. They do boot PIII kernels reliably for all those variants, though they still suffer occasional oopses, hangs, or crashes (as discussed in other threads). However (and here's the part I haven't mentioned before), yesterday I switched one of them to a new mb with a non-VIA chipset (Asus A7A266), and it booted the first Athlon kernel I tried (2.4.4). No other changes to .config, same processor as before, same memory, same disks, same video, same case, same power cord, you name it. Bobby Bryant Austin, Texas - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: REVISED: Experimentation with Athlon and fast_page_copy
On Sat, May 05, 2001 at 03:51:13PM +1200, Chris Wedgwood wrote: > I don't see how they figure, but in case there was any doubt I > have a VIA KT133A/686B board (Abit KT7A) and don't experience > anything resembling disk corruption unless the box crashes for > some other reason. I do seem to be experiencing AGP problems in > spades, but my disks at least are fine. > > I too seem no disk problems whatsoever (nothing really interesting > there, many people do not) but am also seeing AGP problems. > > In fact, I had to disable AGP to stop X locking the box hard... yet > agpgart and the video driver (NVidia[1]) both claim to support the > chipset -- does anyone actually have this working?) Not an option with the Radeon unfortunately. At least, not yet. Whenever I find the solution (recently a bunch of people have suggested a bunch of things to try on dri-devel - thanks guys!) I'll post to that list what fixed it since I know I am not the only person seeing this kind of problem. I think some of the guys are looking into improving the docs a bit, so maybe if I find it soon the problem and workaround will get documented. =) -- Joseph Carter <[EMAIL PROTECTED]>Free software developer kb: I demand integrity and honesty in those who i do business with i know my demands are unreasonable, but a guy can dream, can't he? PGP signature
Re: REVISED: Experimentation with Athlon and fast_page_copy
Chris Wedgwood wrote: > > On Fri, May 04, 2001 at 05:26:57PM -0700, Joseph Carter wrote: > > I don't see how they figure, but in case there was any doubt I > have a VIA KT133A/686B board (Abit KT7A) and don't experience > anything resembling disk corruption unless the box crashes for > some other reason. I do seem to be experiencing AGP problems in > spades, but my disks at least are fine. > > I too seem no disk problems whatsoever (nothing really interesting > there, many people do not) but am also seeing AGP problems. > > In fact, I had to disable AGP to stop X locking the box hard... yet > agpgart and the video driver (NVidia[1]) both claim to support the > chipset -- does anyone actually have this working?) My IWILL (KT133A) + GeForce 256 are working fine over AGP. --S - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: REVISED: Experimentation with Athlon and fast_page_copy
> What still stands out is that exactly _zero_ people have reported the same > problem with non VIA chipset Athlons. Sorry Alan, but... My (very) old Athlon 550 (model 1, stepping 2) show it on my MSI MS-6167 (AMD Irongate C4) with your 2.4.4-ac5, now :-( Even with or without apm/acpi enabled. It freezes during "Freeing unused kernel memory: 172k freed". Never saw this before. I am open for any test fixes... -Dieter SuSE 7.1 (glibc-2.2, gcc-2.95.2) Linux version 2.4.4 (root@SunWave1) (gcc version 2.95.2 19991024 (release)) #1 Sun Apr 29 02:30:34 CEST 2001 BIOS-provided physical RAM map: BIOS-e820: - 0009fc00 (usable) BIOS-e820: 0009fc00 - 000a (reserved) BIOS-e820: 000f - 0010 (reserved) BIOS-e820: 0010 - 13ff (usable) BIOS-e820: 13ff - 13ff3000 (ACPI NVS) BIOS-e820: 13ff3000 - 1400 (ACPI data) BIOS-e820: - 0001 (reserved) Scan SMP from c000 for 1024 bytes. Scan SMP from c009fc00 for 1024 bytes. Scan SMP from c00f for 65536 bytes. Scan SMP from c009f800 for 4096 bytes. On node 0 totalpages: 81904 zone(0): 4096 pages. zone(1): 77808 pages. zone(2): 0 pages. mapped APIC to e000 (01555000) SunWave1>cat /proc/cpuinfo processor : 0 vendor_id : AuthenticAMD cpu family : 6 model : 1 model name : AMD-K7(tm) Processor stepping: 2 cpu MHz : 548.950 cache size : 512 KB fdiv_bug: no hlt_bug : no f00f_bug: no coma_bug: no fpu : yes fpu_exception : yes cpuid level : 1 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 sep mtrr pge mca cmov pat mmx syscall mmxext 3dnowext 3dnow bogomips: 1094.45 -- Dieter Nützel Graduate Student, Computer Science University of Hamburg Department of Computer Science Cognitive Systems Group Vogt-Kölln-Straße 30 D-22527 Hamburg, Germany email: [EMAIL PROTECTED] @home: [EMAIL PROTECTED] - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: REVISED: Experimentation with Athlon and fast_page_copy
On Fri, May 04, 2001 at 06:26:14PM -0400, Aaron Tiensivu wrote: > This might be grasping at straws I remember VIA problem in the "good old > days" of Socket 7 with CPU/PCI Prefetches and especially Read-around-Write > settings that would cause issues like we're seeing with the Athlon > pre-fetches. This could be (total conjecture) related somehow to the > corruption bugs they are admitting to in the 686B although they are blaming > the SB Live now. I don't see how they figure, but in case there was any doubt I have a VIA KT133A/686B board (Abit KT7A) and don't experience anything resembling disk corruption unless the box crashes for some other reason. I do seem to be experiencing AGP problems in spades, but my disks at least are fine. -- Joseph Carter <[EMAIL PROTECTED]>Free software developer <_Anarchy_> Argh.. who's handing out the paper bags 8) PGP signature
Re: REVISED: Experimentation with Athlon and fast_page_copy
> What still stands out is that exactly _zero_ people have reported the same > problem with non VIA chipset Athlons. This might be grasping at straws I remember VIA problem in the "good old days" of Socket 7 with CPU/PCI Prefetches and especially Read-around-Write settings that would cause issues like we're seeing with the Athlon pre-fetches. This could be (total conjecture) related somehow to the corruption bugs they are admitting to in the 686B although they are blaming the SB Live now. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: REVISED: Experimentation with Athlon and fast_page_copy
> prefetch 320(%0) can fetch memory behind the end of the source page. > Perhaps it accesses memory in the ISA hole, or beyond the end of memory? > Could you post the e820 map from dmesg? > > It's possible to build manually a memory map. > Could you build one with wide margins from "dangerous" areas? (untested: > mem=exactmap mem=620k@0 mem=M@1M) > > Then boot with prefetch enabled. That might not be the actual bug but for rev 1 Athlon it is a real bug. The first step athlons have an unfortunate problem in that will prefetch memory marked uncachable and corrupt their caches with it. Arjan - care to unroll the tail 320 bytes of copying from the main loop ? - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: REVISED: Experimentation with Athlon and fast_page_copy
> the memory copy in the fast_page_copy routine. The machine then > proceeded > not to stop at my panic, but I got my "normal" oopses. I then had an Ok > idea and removed all the prefetch instructions from the beginning of the > routine and tried the resultin kernel. I now have no crashes. > What could this mean? I think it has to mean a hardware problem. > Here is a nother patch just so you can keep me honest if I > made another mistake: There is a mistake but you wont trigger it. It is no longer 26 bytes 8) That patch is only used when the prefetchw faults with an illegal instruction and is done so you can boot an athlon kernel on a lesser cpu The prefetch instructions hint to the CPU what memory we will access very soon. The primary effect of that is that we hit full theoretical memory bandwidth when copying pages. It doesnt really change execution behaviour in any other way which then does rather point to cpu or other hardware problem. The very early athlons had prefetch bugs but we would not trigger those and no reporters have such an early CPU. What still stands out is that exactly _zero_ people have reported the same problem with non VIA chipset Athlons. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: REVISED: Experimentation with Athlon and fast_page_copy
Seth Goldberg wrote: > > Hi, > > After removing my head from my a**, I revised the code that checks > the memory copy in the fast_page_copy routine. The machine then > proceeded > not to stop at my panic, but I got my "normal" oopses. I then had an > idea and removed all the prefetch instructions from the beginning of the > routine and tried the resultin kernel. I now have no crashes. > What could this mean? What are your "normal" oopses? -- Brian Gerst - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: REVISED: Experimentation with Athlon and fast_page_copy
On Fri, 4 May 2001, Manfred Spraul wrote: | > --- | > > __asm__ __volatile__ ( | > 158c157 | > < "3: movw $0x1AEB, 1b\n" | > --- | > > "3: movw $0x1AEB, 1b\n" /* jmp on 26 bytes */ | > 166c165 | > < */ | > --- | > > | > 170c169 | > < "1: nop\n" /* prefetch 320(%0)\n" */ | > --- | > > "1: prefetch 320(%0)\n" | > - | > Please let me know if that makes sense :). | | Very interesting. | You've removed only the prefetch 320(%0), not the other prefetch | instructions? No, I have removed them all -- I just commented the block above it completely out :). (maybe you didn't see the whole patch?) --Seth - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: REVISED: Experimentation with Athlon and fast_page_copy
> --- > > __asm__ __volatile__ ( > 158c157 > < "3: movw $0x1AEB, 1b\n" > --- > > "3: movw $0x1AEB, 1b\n" /* jmp on 26 bytes */ > 166c165 > < */ > --- > > > 170c169 > < "1: nop\n" /* prefetch 320(%0)\n" */ > --- > > "1: prefetch 320(%0)\n" > - > Please let me know if that makes sense :). Very interesting. You've removed only the prefetch 320(%0), not the other prefetch instructions? prefetch 320(%0) can fetch memory behind the end of the source page. Perhaps it accesses memory in the ISA hole, or beyond the end of memory? Could you post the e820 map from dmesg? It's possible to build manually a memory map. Could you build one with wide margins from "dangerous" areas? (untested: mem=exactmap mem=620k@0 mem=M@1M) Then boot with prefetch enabled. -- Manfred - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
