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Message-ID: <Pine.LNX.4.64.0706011409590.3716@p34.internal.lan> Date: Fri, 1 Jun 2007 14:10:09 -0400 (EDT) From: Justin Piszcz <jpiszcz@...idpixels.com> To: Robert Hancock <hancockr@...w.ca> cc: Parag Warudkar <parag.warudkar@...il.com>, linux-kernel@...r.kernel.org Subject: Re: Case: 7454422: Re: Kernel 2.6.21.3 does not work with 8GB of RAM on Intel 965WH motherboards. (FULL DMESG) On Fri, 1 Jun 2007, Justin Piszcz wrote: > > > On Fri, 1 Jun 2007, Justin Piszcz wrote: > >> >> >> On Wed, 30 May 2007, Robert Hancock wrote: >> >>> Parag Warudkar wrote: >>>> Robert Hancock wrote: >>>> >>>> >>>>> 0-3319MB >>>>> 4096-8832MB >>>>> >>>>> leaving 64MB of memory at the top of RAM uncached. What do you want to >>>>> bet that something important (kernel code?) is getting loaded there.. >>>>> >>>>> So essentially it's a BIOS problem, it's not setting up the MTRRs >>>>> properly in order to map all of RAM as cacheable. As Andi says, complain >>>>> to Intel. >>>>> >>>> >>>> Could the BADRAM patch be useful for him? >>>> http://rick.vanrein.org/linux/badram/download.html has 2.6.21 version. >>>> It says it supports x86_64. May be using this patch he can exclude >>>> that RAM from being used/accessed? >>> >>> I think that mem=8832M would work as well, to make the kernel use only the >>> memory that is marked cacheable. (It looks like this parameter takes the >>> highest memory address we want the kernel to use, not the highest memory >>> amount.) >>> >>> -- >>> Robert Hancock Saskatoon, SK, Canada >>> To email, remove "nospam" from hancockr@...pamshaw.ca >>> Home Page: http://www.roberthancock.com/ >>> >> >> Is 8832MB a typo? 8GB of memory is ~8192MB right? Did you mean 8132MB or? >> Intel wants me to flash my bios and reset everything to the defaults to see >> if it is still an issue, I'd prefer to try the mem= option first. >> >> Justin. >> > > mem=8064M" [top: Mem: 7264144k total] > mem=8832M" [top: Mem: 8039820k total] > > I am using 8832MB and it does not have the bug/slowness! How did you > calculate that from the MTRR output? > > $ cat /proc/mtrr > reg00: base=0x00000000 ( 0MB), size=2048MB: write-back, count=1 > reg01: base=0x80000000 (2048MB), size=1024MB: write-back, count=1 > reg02: base=0xc0000000 (3072MB), size= 256MB: write-back, count=1 > reg03: base=0xcf800000 (3320MB), size= 8MB: uncachable, count=1 > reg04: base=0xcf700000 (3319MB), size= 1MB: uncachable, count=1 > reg05: base=0x100000000 (4096MB), size=4096MB: write-back, count=1 > reg06: base=0x200000000 (8192MB), size= 512MB: write-back, count=1 > reg07: base=0x220000000 (8704MB), size= 128MB: write-back, count=1 > > It sees 7.66GB now! > > 8039820 / 1024 / 1024 > 7.66GB > > top - 13:56:48 up 3 min, 5 users, load average: 0.12, 0.14, 0.06 > Tasks: 163 total, 1 running, 162 sleeping, 0 stopped, 0 zombie > Cpu0 : 4.4%us, 1.4%sy, 0.2%ni, 89.7%id, 4.1%wa, 0.0%hi, 0.1%si, > 0.0%st > Cpu1 : 0.1%us, 0.5%sy, 0.6%ni, 98.4%id, 0.3%wa, 0.0%hi, 0.0%si, > 0.0%st > Cpu2 : 1.2%us, 0.3%sy, 0.1%ni, 97.9%id, 0.5%wa, 0.0%hi, 0.0%si, > 0.0%st > Cpu3 : 0.2%us, 1.9%sy, 0.7%ni, 96.0%id, 1.1%wa, 0.0%hi, 0.0%si, > 0.0%st > Mem: 8039820k total, 1039588k used, 7000232k free, 3552k buffers > Swap: 16787768k total, 0k used, 16787768k free, 141480k cached > > > > Ahh here we go: Justin Piszcz wrote: > That output looked nasty, attaching entries from syslog. > > Justin. Here's your E820 memory map, from dmesg: BIOS-e820: 0000000000000000 - 000000000008f000 (usable) BIOS-e820: 000000000008f000 - 00000000000a0000 (reserved) BIOS-e820: 00000000000e0000 - 0000000000100000 (reserved) BIOS-e820: 0000000000100000 - 00000000cf58f000 (usable) BIOS-e820: 00000000cf58f000 - 00000000cf59c000 (reserved) BIOS-e820: 00000000cf59c000 - 00000000cf653000 (usable) BIOS-e820: 00000000cf653000 - 00000000cf6a5000 (ACPI NVS) BIOS-e820: 00000000cf6a5000 - 00000000cf6a8000 (ACPI data) BIOS-e820: 00000000cf6a8000 - 00000000cf6ef000 (ACPI NVS) BIOS-e820: 00000000cf6ef000 - 00000000cf6f1000 (ACPI data) BIOS-e820: 00000000cf6f1000 - 00000000cf6f2000 (usable) BIOS-e820: 00000000cf6f2000 - 00000000cf6ff000 (ACPI data) BIOS-e820: 00000000cf6ff000 - 00000000cf700000 (usable) BIOS-e820: 00000000cf700000 - 00000000d0000000 (reserved) BIOS-e820: 00000000fff00000 - 0000000100000000 (reserved) BIOS-e820: 0000000100000000 - 000000022c000000 (usable) so the usable memory ranges are: 0-572K 1MB-3317.55MB 3317.60MB-3317.75MB 3318.94MB-3318.945MB 3318.996MB-3319MB 4096MB-8896MB and the MTRRs (from /proc/mtrr, from private email): reg00: base=0x00000000 ( 0MB), size=2048MB: write-back, count=1 reg01: base=0x80000000 (2048MB), size=1024MB: write-back, count=1 reg02: base=0xc0000000 (3072MB), size= 256MB: write-back, count=1 reg03: base=0xcf800000 (3320MB), size= 8MB: uncachable, count=1 reg04: base=0xcf700000 (3319MB), size= 1MB: uncachable, count=1 reg05: base=0x100000000 (4096MB), size=4096MB: write-back, count=1 reg06: base=0x200000000 (8192MB), size= 512MB: write-back, count=1 reg07: base=0x220000000 (8704MB), size= 128MB: write-back, count=1 so the ranges mapped as cacheable are: 0-3319MB 4096-8832MB leaving 64MB of memory at the top of RAM uncached. What do you want to bet that something important (kernel code?) is getting loaded there.. So essentially it's a BIOS problem, it's not setting up the MTRRs properly in order to map all of RAM as cacheable. As Andi says, complain to Intel. -- Robert Hancock Saskatoon, SK, Canada To email, remove "nospam" from hancockr@...pamshaw.ca Home Page: http://www.roberthancock.com/ - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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