Re: [LinuxBIOS] NUMA support for dual core Opteron

[yhlu]

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  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.
> > 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.