What does your mtrr look like? How about dmesg? Might be the stupid
mtrr setup some bioses have been doing on intel chips where it would do:
4GB range at 4GB
1GB range at 8GB
512MB range at 9GB
256MB range at 9.5GB
etc.
And then it runs out of entries (which pisses of X).
The simple solution would have been to assign an 8GB range at 4GB or
maybe a 4GB range at 4GB and a 2GB range at 8GB to cover all the ram.
Without the mtrr coverage you get no caching of that memory which makes
use that that section of memory slow. To make the system useable there
is code in the kernel to discard any memory the BIOS didn't correctly
cover with an mtrr cachable entry.
I have 2.6.22.6 kernel
First MTRR looks good for me.
Why it was rejected?
And how to force using it?
here are more details
[EMAIL PROTECTED] ~]# cat /proc/mtrr
reg00: base=0x100000000 (4096MB), size=8192MB: write-back, count=1
reg01: base=0x280000000 (10240MB), size=2048MB: uncachable, count=1
reg02: base=0x260000000 (9728MB), size= 512MB: uncachable, count=1
reg03: base=0x00000000 ( 0MB), size=4096MB: write-back, count=1
reg04: base=0xc0000000 (3072MB), size=1024MB: uncachable, count=1
reg05: base=0xa0000000 (2560MB), size= 512MB: uncachable, count=1
reg06: base=0x9ff00000 (2559MB), size= 1MB: write-through, count=1
[EMAIL PROTECTED] ~]# dmesg|grep mtrr
mtrr: your CPUs had inconsistent variable MTRR settings
mtrr: probably your BIOS does not setup all CPUs.
mtrr: corrected configuration.
and other interesting dmesg fragments:
Entering add_active_range(0, 0, 159) 0 entries of 3200 used
Entering add_active_range(0, 256, 655072) 1 entries of 3200 used
Entering add_active_range(0, 1048576, 2097152) 2 entries of 3200 used
end_pfn_map = 2097152
DMI 2.4 present.
ACPI: RSDP 000F6F10, 0014 (r0 GBT )
ACPI: RSDT 9FEE3040, 003C (r1 GBT GBTUACPI 42302E31 GBTU 1010101)
ACPI: FACP 9FEE30C0, 0074 (r1 GBT GBTUACPI 42302E31 GBTU 1010101)
ACPI: DSDT 9FEE3180, 4A88 (r1 GBT GBTUACPI 1000 MSFT 100000C)
ACPI: FACS 9FEE0000, 0040
ACPI: HPET 9FEE7D80, 0038 (r1 GBT GBTUACPI 42302E31 GBTU 98)
ACPI: MCFG 9FEE7E00, 003C (r1 GBT GBTUACPI 42302E31 GBTU 1010101)
ACPI: APIC 9FEE7C80, 0084 (r1 GBT GBTUACPI 42302E31 GBTU 1010101)
ACPI: SSDT 9FEE7E80, 015C (r1 PmRef Cpu0Ist 3000 INTL 20040311)
ACPI: SSDT 9FEE8430, 0275 (r1 PmRef CpuPm 3000 INTL 20040311)
No NUMA configuration found
Faking a node at 0000000000000000-0000000200000000
Entering add_active_range(0, 0, 159) 0 entries of 3200 used
Entering add_active_range(0, 256, 655072) 1 entries of 3200 used
Entering add_active_range(0, 1048576, 2097152) 2 entries of 3200 used
Bootmem setup node 0 0000000000000000-0000000200000000
Zone PFN ranges:
DMA 0 -> 4096
DMA32 4096 -> 1048576
Normal 1048576 -> 2097152
early_node_map[3] active PFN ranges
0: 0 -> 159
0: 256 -> 655072
0: 1048576 -> 2097152
On node 0 totalpages: 1703551
DMA zone: 56 pages used for memmap
DMA zone: 1125 pages reserved
DMA zone: 2818 pages, LIFO batch:0
DMA32 zone: 14280 pages used for memmap
DMA32 zone: 636696 pages, LIFO batch:31
Normal zone: 14336 pages used for memmap
Normal zone: 1034240 pages, LIFO batch:31
ACPI: HPET id: 0x8086a201 base: 0xfed00000
Using ACPI (MADT) for SMP configuration information
swsusp: Registered nosave memory region: 000000000009f000 -
00000000000a0000
swsusp: Registered nosave memory region: 00000000000a0000 -
00000000000f0000
swsusp: Registered nosave memory region: 00000000000f0000 -
0000000000100000
swsusp: Registered nosave memory region: 000000009fee0000 -
000000009fee3000
swsusp: Registered nosave memory region: 000000009fee3000 -
000000009fef0000
swsusp: Registered nosave memory region: 000000009fef0000 -
000000009ff00000
swsusp: Registered nosave memory region: 000000009ff00000 -
00000000c0000000
swsusp: Registered nosave memory region: 00000000c0000000 -
00000000c4000000
swsusp: Registered nosave memory region: 00000000c4000000 -
00000000fec00000
swsusp: Registered nosave memory region: 00000000fec00000 -
0000000100000000
Allocating PCI resources starting at c8000000 (gap: c4000000:3ac00000)
SMP: Allowing 4 CPUs, 0 hotplug CPUs
PERCPU: Allocating 36744 bytes of per cpu data
Built 1 zonelists. Total pages: 1673754
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