On Tue, 2008-01-08 at 00:16 +0200, Izik Eidus wrote: > Dave Hansen wrote: > > With kvm-44, I thought my kernel was freezing during boot if I gave it > > 1G of RAM. But, it boots fine with 512M. > > > > So, I instrumented the kernel, and found out that it is just taking a > > long time to memset a 58MB area of memory for mem_map[]. It appears to > > be taking a mmio_exit for every access of every byte of memory. The end > > result is a ~100kbps memset() speed. Yes, 100 kilobytes/sec. > > > > I just tried kvm from git, and the kernel doesn't even get that far. I > > see this in debugfs > > > > insn_emulation:1393985 > > > > even before I get a single kernel message. And it keeps going up, fast. > > I can get the kernel to boot just fine if I give it less than 896MB of > > RAM. > > > > kvm-44 boots long enough for me to see a really funky e820 table: > > > > BIOS-provided physical RAM map: > > BIOS-e820: 0000000000000000 - 000000000009fc00 (usable) > > BIOS-e820: 000000000009fc00 - 00000000000a0000 (reserved) > > BIOS-e820: 00000000000e8000 - 0000000000100000 (reserved) > > BIOS-e820: 0000000000100000 - 00000000fffbd000 (usable) > > BIOS-e820: 00000000fffbd000 - 00000000ffff0000 (reserved) > > > > Note that this is with '-m 1G'!! It looks to me like one of those > > sections is basically from 0x100000 up to ~4G and *usable*. That > > doesn't look right. > > > yea it really dont look right, it look like it for some reason map the > whole memory up untill the bios to the kernel as memory > it even map it on the pci hole so... > hrmmm, very weird, > > what is your host info (32/64 amd/intel kernel...)?
64-bit intel host, kernel 2.6.24-rc5 Running kvm's current git userspace with modules from the same version. > and what is the > guest info (kernel 32/64...) ? 32-bit 2.6.23-rc6-mm1 > and what happen if you run it with -no-kvm ? Both current -git and kvm-44 seem to lock up at early kernel boot before even early printk is available. But, GRUB comes up in both cases. -no-kvm doesn't seem to change things at all. -- Dave ------------------------------------------------------------------------- Check out the new SourceForge.net Marketplace. It's the best place to buy or sell services for just about anything Open Source. http://ad.doubleclick.net/clk;164216239;13503038;w?http://sf.net/marketplace _______________________________________________ kvm-devel mailing list kvm-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/kvm-devel
