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SubjectRe: [LinuxBIOS] NUMA support for dual core Opteron
For S2895, with 1Gx8 Installed and E stepping dual core opteron with
1G mem hole emable, got

Bootdata ok (command line is apic=debug ramdisk_size=65536
root=/dev/ram0 rw console=tty0 console=ttyS0,115200n8 )
Linux version 2.6.12-rc5 (root@tst288xsuse9) (gcc version 3.3.3 (SuSE
Linux)) #26 SMP Thu Jun 2 18:15:44 PDT 2005
BIOS-provided physical RAM map:
BIOS-e820: 0000000000000000 - 0000000000000dd0 (reserved)
BIOS-e820: 0000000000000dd0 - 00000000000a0000 (usable)
BIOS-e820: 00000000000f0000 - 00000000000f0400 (reserved)
BIOS-e820: 0000000000100000 - 00000000c0000000 (usable)
BIOS-e820: 0000000100000000 - 0000000240000000 (usable)
ACPI: Unable to locate RSDP
Scanning NUMA topology in Northbridge 24
Number of nodes 2
Node 0 MemBase 0000000000000000 Limit 000000013fffffff
Node 1 MemBase 0000000140000000 Limit 000000023fffffff
node 1 shift 24 addr 140000000 conflict 0
node 1 shift 25 addr 1fe000000 conflict 0
Using node hash shift of 26
Bootmem setup node 0 0000000000000000-000000013fffffff
Bootmem setup node 1 0000000140000000-000000023fffffff

~ # cat /proc/mt~ # cat /proc/mtrr
reg00: base=0x00000000 ( 0MB), size=8192MB: write-back, count=1
reg01: base=0x200000000 (8192MB), size=1024MB: write-back, count=1
reg02: base=0xc0000000 (3072MB), size=1024MB: uncachable, count=1
with suse kernel and LinuxBIOS + S2882 I can get

linux:~ # cat /proc/meminfo
total: used: free: shared: buffers: cached:
Mem: 8131170304 145051648 7986118656 0 15220736 66543616
Swap: 2154979328 0 2154979328
MemTotal: 7940596 kB
MemFree: 7798944 kB
MemShared: 0 kB
Buffers: 14864 kB
Cached: 64984 kB
SwapCached: 0 kB
Active: 39056 kB
Inactive: 40844 kB
HighTotal: 0 kB
HighFree: 0 kB
LowTotal: 7940596 kB
LowFree: 7798944 kB
SwapTotal: 2104472 kB
SwapFree: 2104472 kB
BigFree: 0 kB

Node 0 MemTotal: 4194300 kB
Node 0 MemFree: 3793788 kB
Node 0 MemUsed: 400512 kB
Node 0 HighTotal: 0 kB
Node 0 HighFree: 0 kB
Node 0 LowTotal: 4194300 kB
Node 0 LowFree: 3793788 kB

Node 1 MemTotal: 4194300 kB
Node 1 MemFree: 4005156 kB
Node 1 MemUsed: 189144 kB
Node 1 HighTotal: 0 kB
Node 1 HighFree: 0 kB
Node 1 LowTotal: 4194300 kB
Node 1 LowFree: 4005156 kB

I wonder if suse kernel have some special code to show that. in
Kernel.org, I can not Node0....Node 1...
YH

On 7/14/05, Li-Ta Lo <ollie@lanl.gov> wrote:
> On Thu, 2005-07-14 at 10:58 -0700, yhlu wrote:
> > Someone mentioned that NUMA support for dual core opteron need acpi
> > support in LinuxBIOS.
> >
> > there may be some other solution for that.
> > 1. PowerPC already support dual core and it should support NUMA, So
> > the Open Firmware must have some NUMA entry definition.
> > Can we make x86-64 kernel support OpenFirmware interface so we can use
> > OpenBIOS as payload of LinuxBIOS.
> > 2. enable acpi and add the NUMA entries into it, the Linux Kernel will be happy.
> > 3. If we are trying to use ADLO to load Windows/Solaris/FreeBSD, We
> > need to pass related acpi info to ADLO....
> >
> > Solution 1 will be ideal one, and can make Solaris for X86-64 use
> > OpenFirmware interface too.....
> >
> > which one is better?
> >
>
>
> AFIAK, for x86_64 kernel, it will try to read NUMA configuration from
> HW directory. We don't have to export any ACPI table.
>
> --
> Li-Ta Lo <ollie@lanl.gov>
> Los Alamos National Lab
>
>
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