FYI in Tyan S4881 (8 ways dual core 875 cpu ) with LinuxBIOS I got
also the 1G mem hole is enabled.
So the kernel should be OK with read NUMA directly from HW.
YH
Firmware type: LinuxBIOS
old bootloader convention, maybe loadlin?
Bootdata ok (command line is apic=debug ramdisk_size=65536
root=/dev/ram0 rw console=tty0 console=ttyS0,115200n8 )
Linux version 2.6.12 (root@tst288xsuse9) (gcc version 3.3.3 (SuSE
Linux)) #8 SMP Fri Jun 24 12:41:43 PDT 2005
BIOS-provided physical RAM map:
BIOS-e820: 0000000000000000 - 0000000000000e48 (reserved)
BIOS-e820: 0000000000000e48 - 00000000000a0000 (usable)
BIOS-e820: 00000000000f0000 - 00000000000f0400 (reserved)
BIOS-e820: 0000000000100000 - 00000000c0000000 (usable)
BIOS-e820: 0000000100000000 - 0000000840000000 (usable)
Scanning NUMA topology in Northbridge 24
Number of nodes 8
Node 0 MemBase 0000000000000000 Limit 000000013fffffff
Node 1 MemBase 0000000140000000 Limit 000000023fffffff
Node 2 MemBase 0000000240000000 Limit 000000033fffffff
Node 3 MemBase 0000000340000000 Limit 000000043fffffff
Node 4 MemBase 0000000440000000 Limit 000000053fffffff
Node 5 MemBase 0000000540000000 Limit 000000063fffffff
Node 6 MemBase 0000000640000000 Limit 000000073fffffff
Node 7 MemBase 0000000740000000 Limit 000000083fffffff
node 1 shift 24 addr 140000000 conflict 0
node 1 shift 25 addr 1fe000000 conflict 0
node 3 shift 26 addr 3fc000000 conflict 0
node 7 shift 27 addr 7f8000000 conflict 0
Using node hash shift of 28
Bootmem setup node 0 0000000000000000-000000013fffffff
Bootmem setup node 1 0000000140000000-000000023fffffff
Bootmem setup node 2 0000000240000000-000000033fffffff
Bootmem setup node 3 0000000340000000-000000043fffffff
Bootmem setup node 4 0000000440000000-000000053fffffff
Bootmem setup node 5 0000000540000000-000000063fffffff
Bootmem setup node 6 0000000640000000-000000073fffffff
Bootmem setup node 7 0000000740000000-000000083fffffff
in LB
Setting variable MTRR 0, base: 0MB, range: 32768MB, type WB
Setting variable MTRR 1, base: 32768MB, range: 1024MB, type WB
Setting variable MTRR 2, base: 3072MB, range: 1024MB, type UC
On 7/14/05, Andi Kleen <[email protected]> wrote:
> > AFIAK, for x86_64 kernel, it will try to read NUMA configuration from
> > HW directory. We don't have to export any ACPI table.
>
> It doesn't work for dual core or 8 sockets for some reason. Since the SRAT
> code works fine and is in general more future proof we never tracked down
> why. Patches welcome.
>
> However you'll likely need ACPI for other reasons anyways, e.g. for
> better power saving.
>
> -Andi
>
>
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