Messages in this thread |  | | | Date | Wed, 30 May 2007 21:56:21 -0700 | | From | "Yinghai Lu" <> | | Subject | Re: Case: 7454422: Re: Kernel 2.6.21.3 does not work with 8GB of RAM on Intel 965WH motherboards. (FULL DMESG) |
On 5/30/07, Robert Hancock <hancockr@shaw.ca> wrote: > 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.
the BIOS used up of VAR MTRR ( = 8).
it supposed change to sth like > reg00: base=0x00000000 ( 0MB), size=4096MB: write-back, count=1 > reg01: base=, size=64MB: uncachable, count=1 > reg02: base=, size=128MB: uncachable, count=1 > reg03: base=, size=512MB: uncachable, count=1 > reg04: base=0x100000000 (4096MB), size=4096MB: write-back, count=1 > reg05: base=0x200000000 (8192MB), size= 512MB: write-back, count=1 > reg06: base=0x220000000 (8704MB), size= 128MB: write-back, count=1 > reg07: base=(8832MB), size= 64MB: write-back, count=1
or you can set var mtrr and then use kexec to load another kernel.
AMD Rev F later cpu, will assume 4G above is write back, and even without var mtrr for it.
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