Re: [gentoo-user] Linux too damn slow if memory 3GB
On 29/07/07, Daniel van Ham Colchete [EMAIL PROTECTED] wrote: Hello everyone!!! May be somebody can shed some light here... I'm building a server here with 4GB of RAM memory. The fact is, if I boot with mem=3072M everything goes as fast as it should but I'm not using 1GB of memory. If I don't put the mem option, Linux will see 4GB of memory available but it will be damn slow (really). It sounds like a problem with a buggy BIOS not setting up your MTRR properly. This means linux ends up using ultra-slow memory for important stuff. The problem has been discussed quite a bit on LKML, see here, for example: http://marc.info/?l=linux-kernelm=118072237228294 Any lights would be very appreciated. Try upgrading to the latest BIOS version available for your motherboard. If that doesn't fix it you will have to tell linux not to use the affected memory. You can find out where that is by checking your dmesg and /proc/mtrr, as described in the message referenced above. Post the information here if you aren't sure. Cheers, Duane. -- I never could learn to drink that blood and call it wine - Bob Dylan -- [EMAIL PROTECTED] mailing list
Re: [gentoo-user] Linux too damn slow if memory 3GB
On 7/28/07, Stroller [EMAIL PROTECTED] wrote: On 29 Jul 2007, at 00:28, Daniel van Ham Colchete wrote: ... The fact is, if I boot with mem=3072M everything goes as fast as it should but I'm not using 1GB of memory. If I don't put the mem option, Linux will see 4GB of memory available but it will be damn slow (really). ... My processor is a Intel Core 2 Duo E6320 (1.86Ghz). The motherboard is Intel. I'm running Gentoo at 32bits mode and the kernel version is 2.6.20-gentoo-r8. Hi there, Does your Intel motherboard feature the 945PM chipset? I read about this last week: http://listserver.themacintoshguy.com/pipermail/x4u/2007-July/ 018031.html Stroller. -- [EMAIL PROTECTED] mailing list Stoller, actually it's the 965, but the link Tim sent me shows that it's not a chipset limitation... It's a 32bits design limitation... Best, Daniel
Re: [gentoo-user] Linux too damn slow if memory 3GB
Daniel van Ham Colchete skrev: actually it's the 965, but the link Tim sent me shows that it's not a chipset limitation... It's a 32bits design limitation... Thats not true, I run 32bit Gentoo with 4 GB Memory and has no slowdown issues I can measure with the naked eye. Seems to me like you have some hardware problem. smime.p7s Description: S/MIME Cryptographic Signature
Re: [gentoo-user] Linux too damn slow if memory 3GB
On 7/30/07, Steen Eugen Poulsen [EMAIL PROTECTED] wrote: Daniel van Ham Colchete skrev: actually it's the 965, but the link Tim sent me shows that it's not a chipset limitation... It's a 32bits design limitation... Thats not true, I run 32bit Gentoo with 4 GB Memory and has no slowdown issues I can measure with the naked eye. Seems to me like you have some hardware problem. I have two Gentoo systems (2.6.x) one with 4G and another with 8G. Both systems are are wicked fast. On the 4G `free` shows all but 21K of physical used, on the 8G there's still 2G free and the system is highly responsive. Can't remember which MB chipset I have, sorry. multiple Intel multicore cpu in both.
Re: [gentoo-user] Linux too damn slow if memory 3GB
On 7/30/07, Developer Edoceo [EMAIL PROTECTED] wrote: On 7/30/07, Steen Eugen Poulsen [EMAIL PROTECTED] wrote: Daniel van Ham Colchete skrev: actually it's the 965, but the link Tim sent me shows that it's not a chipset limitation... It's a 32bits design limitation... Thats not true, I run 32bit Gentoo with 4 GB Memory and has no slowdown issues I can measure with the naked eye. Seems to me like you have some hardware problem. I have two Gentoo systems (2.6.x) one with 4G and another with 8G. Both systems are are wicked fast. On the 4G `free` shows all but 21K of physical used, on the 8G there's still 2G free and the system is highly responsive. Can't remember which MB chipset I have, sorry. multiple Intel multicore cpu in both. What kernel version are you using?
[gentoo-user] Linux too damn slow if memory 3GB
Hello everyone!!! May be somebody can shed some light here... I'm building a server here with 4GB of RAM memory. The fact is, if I boot with mem=3072M everything goes as fast as it should but I'm not using 1GB of memory. If I don't put the mem option, Linux will see 4GB of memory available but it will be damn slow (really). To make Linux recognize 4 gigs of memory I had to activate HIGHMEM=64GB, otherwise it only recognizes 3279MB (but it is fast). My processor is a Intel Core 2 Duo E6320 (1.86Ghz). The motherboard is Intel. I'm running Gentoo at 32bits mode and the kernel version is 2.6.20-gentoo-r8. Any lights would be very appreciated. Best regards, Daniel Colchete
Re: [gentoo-user] Linux too damn slow if memory 3GB
On Sat, 2007-07-28 at 20:28 -0300, Daniel van Ham Colchete wrote: Hello everyone!!! May be somebody can shed some light here... I'm building a server here with 4GB of RAM memory. The fact is, if I boot with mem=3072M everything goes as fast as it should but I'm not using 1GB of memory. If I don't put the mem option, Linux will see 4GB of memory available but it will be damn slow (really). To make Linux recognize 4 gigs of memory I had to activate HIGHMEM=64GB, otherwise it only recognizes 3279MB (but it is fast). My processor is a Intel Core 2 Duo E6320 (1.86Ghz). The motherboard is Intel. I'm running Gentoo at 32bits mode and the kernel version is 2.6.20-gentoo-r8. Any lights would be very appreciated. Best regards, Daniel Colchete I don't actually run 4GB of RAM in any of my intel systems, so I can't comment from experience, however my suspicion would be the overhead introduced from PAE, which (at least on older kernels) requires some processing overhead to utilise. Are you able to try a 64-bit install to determine if this is the case? Regards, Tim Allingham Email:[EMAIL PROTECTED] signature.asc Description: This is a digitally signed message part
Re: [gentoo-user] Linux too damn slow if memory 3GB
On Sun, 2007-07-29 at 09:39 +1000, Tim Allingham wrote: On Sat, 2007-07-28 at 20:28 -0300, Daniel van Ham Colchete wrote: Hello everyone!!! May be somebody can shed some light here... I'm building a server here with 4GB of RAM memory. The fact is, if I boot with mem=3072M everything goes as fast as it should but I'm not using 1GB of memory. If I don't put the mem option, Linux will see 4GB of memory available but it will be damn slow (really). To make Linux recognize 4 gigs of memory I had to activate HIGHMEM=64GB, otherwise it only recognizes 3279MB (but it is fast). My processor is a Intel Core 2 Duo E6320 (1.86Ghz). The motherboard is Intel. I'm running Gentoo at 32bits mode and the kernel version is 2.6.20-gentoo-r8. Any lights would be very appreciated. Best regards, Daniel Colchete I don't actually run 4GB of RAM in any of my intel systems, so I can't comment from experience, however my suspicion would be the overhead introduced from PAE, which (at least on older kernels) requires some processing overhead to utilise. Are you able to try a 64-bit install to determine if this is the case? Regards, Tim Allingham Email:[EMAIL PROTECTED] just to add, this page gives a reasonable explanation of the problems with 32-bit OS's trying to address large RAM volumes http://www.dansdata.com/askdan00015.htm signature.asc Description: This is a digitally signed message part
Re: [gentoo-user] Linux too damn slow if memory 3GB
On 29 Jul 2007, at 00:28, Daniel van Ham Colchete wrote: ... The fact is, if I boot with mem=3072M everything goes as fast as it should but I'm not using 1GB of memory. If I don't put the mem option, Linux will see 4GB of memory available but it will be damn slow (really). ... My processor is a Intel Core 2 Duo E6320 (1.86Ghz). The motherboard is Intel. I'm running Gentoo at 32bits mode and the kernel version is 2.6.20-gentoo-r8. Hi there, Does your Intel motherboard feature the 945PM chipset? I read about this last week: http://listserver.themacintoshguy.com/pipermail/x4u/2007-July/ 018031.html Stroller. -- [EMAIL PROTECTED] mailing list
Re: [gentoo-user] Linux too damn slow if memory 3GB
On 7/28/07, Tim Allingham [EMAIL PROTECTED] wrote: On Sun, 2007-07-29 at 09:39 +1000, Tim Allingham wrote: I don't actually run 4GB of RAM in any of my intel systems, so I can't comment from experience, however my suspicion would be the overhead introduced from PAE, which (at least on older kernels) requires some processing overhead to utilise. Are you able to try a 64-bit install to determine if this is the case? Regards, Tim Allingham Email:[EMAIL PROTECTED] just to add, this page gives a reasonable explanation of the problems with 32-bit OS's trying to address large RAM volumes http://www.dansdata.com/askdan00015.htm That is very very very sad... The fact is I can't use 64bits for now... So let's take one gig out! Thanks for your help Daniel
