On Wednesday 06 February 2008 12:41:15 am Pavel Emelyanov wrote:
> Yinghai Lu wrote:
> > On Tuesday 05 February 2008 11:10:24 pm Pavel Emelyanov wrote:
> >> [snip]
> >>
> >>>>> What other info from me is required?
> >>> boot log please. with the patch and reverting the patch.
> >> Here they are (attached).
> >> BTW, I found, that the sky2 adapter is broken by this patch as well.
> >> To simplify the analysis, here's their diff:
> >>
> >> --- bad-log 2008-02-06 10:06:40.000000000 +0300
> >> +++ good-log 2008-02-06 10:06:40.000000000 +0300
> >> @@ -1,4 +1,4 @@
> >> -Linux version 2.6.24 ([EMAIL PROTECTED]) (gcc version 4.1.3 20070724
> >> (prerelease) (SUSE Linux)) #22 SMP Tue Feb 5 20:09:11 MSK 2008
> >> +Linux version 2.6.24 ([EMAIL PROTECTED]) (gcc version 4.1.3 20070724
> >> (prerelease) (SUSE Linux)) #23 SMP Wed Feb 6 10:03:53 MSK 2008
> >> BIOS-provided physical RAM map:
> >> BIOS-e820: 0000000000000000 - 000000000009f800 (usable)
> >> BIOS-e820: 000000000009f800 - 00000000000a0000 (reserved)
> >> @@ -19,29 +19,6 @@ Scan SMP from c0000000 for 1024 bytes.
> >> Scan SMP from c009fc00 for 1024 bytes.
> >> Scan SMP from c00f0000 for 65536 bytes.
> >> found SMP MP-table at [c00ff780] 000ff780
> >> -***************
> >> -**** WARNING: likely BIOS bug
> >> -**** MTRRs don't cover all of memory, trimmed 786432 pages
> >> -***************
> >> -update e820 for mtrr
> >> -modified physical RAM map:
> >> - modified: 0000000000000000 - 000000000009f800 (usable)
> >> - modified: 000000000009f800 - 00000000000a0000 (reserved)
> >> - modified: 00000000000e0000 - 0000000000100000 (reserved)
> >> - modified: 0000000000100000 - 0000000040000000 (usable)
> >> - modified: 0000000040000000 - 00000000bfff0000 (reserved)
> >> - modified: 00000000bfff0000 - 00000000bffff000 (ACPI data)
> >> - modified: 00000000bffff000 - 00000000c0000000 (ACPI NVS)
> >> - modified: 00000000c0000000 - 0000000100000000 (reserved)
> >> - modified: 0000000100000000 - 0000000140000000 (usable)
> >
> > the root cause could be your mtrr last entry for RAM has strange type
> >
> > please apply the following line to print the mtrr before trimming to
> > current linus tree.
>
> OK, here's the dmesg diff:
> --- bad-log 2008-02-06 10:01:21.000000000 +0300
> +++ bad-log-info 2008-02-06 11:37:51.000000000 +0300
> @@ -19,6 +19,14 @@ Scan SMP from c0000000 for 1024 bytes.
> Scan SMP from c009fc00 for 1024 bytes.
> Scan SMP from c00f0000 for 65536 bytes.
> found SMP MP-table at [c00ff780] 000ff780
> +i=0 c0000 - 100000 0
> +i=1 0 - 100000 6
> +i=2 100000 - 140000 6
> +i=3 0 - 0 0
> +i=4 0 - 0 0
> +i=5 0 - 0 0
> +i=6 0 - 0 0
> +i=7 0 - 0 0
> ***************
> **** WARNING: likely BIOS bug
> **** MTRRs don't cover all of memory, trimmed 786432 pages
please try following patch
diff --git a/arch/x86/kernel/cpu/mtrr/main.c b/arch/x86/kernel/cpu/mtrr/main.c
index 1e27b69..4e7490f 100644
--- a/arch/x86/kernel/cpu/mtrr/main.c
+++ b/arch/x86/kernel/cpu/mtrr/main.c
@@ -659,7 +659,7 @@ static __init int amd_special_default_mtrr(void)
*/
int __init mtrr_trim_uncached_memory(unsigned long end_pfn)
{
- unsigned long i, base, size, highest_addr = 0, def, dummy;
+ unsigned long i, base, size, highest_pfn = 0, def, dummy;
mtrr_type type;
u64 trim_start, trim_size;
@@ -682,28 +682,27 @@ int __init mtrr_trim_uncached_memory(unsigned long
end_pfn)
mtrr_if->get(i, &base, &size, &type);
if (type != MTRR_TYPE_WRBACK)
continue;
- base <<= PAGE_SHIFT;
- size <<= PAGE_SHIFT;
- if (highest_addr < base + size)
- highest_addr = base + size;
+ if (highest_pfn < base + size)
+ highest_pfn = base + size;
}
/* kvm/qemu doesn't have mtrr set right, don't trim them all */
- if (!highest_addr) {
+ if (!highest_pfn) {
printk(KERN_WARNING "WARNING: strange, CPU MTRRs all blank?\n");
WARN_ON(1);
return 0;
}
- if ((highest_addr >> PAGE_SHIFT) < end_pfn) {
+ if (highest_pfn < end_pfn) {
printk(KERN_WARNING "WARNING: BIOS bug: CPU MTRRs don't cover"
" all of memory, losing %LdMB of RAM.\n",
- (((u64)end_pfn << PAGE_SHIFT) - highest_addr) >> 20);
+ (end_pfn - highest_pfn) >> (20 - PAGE_SHIFT));
WARN_ON(1);
printk(KERN_INFO "update e820 for mtrr\n");
- trim_start = highest_addr;
+ trim_start = highest_pfn;
+ trim_start <<= PAGE_SHIFT;
trim_size = end_pfn;
trim_size <<= PAGE_SHIFT;
trim_size -= trim_start;
--
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