Re: Problems with more than 8 AMD Opteron Cores per System

Daniel J Blueman
2005-07-12T10:18:35Z

I find the ondemand governor works as expected with 2.6.12 on my
Athlon64 Winchester [1]; as soon as I bzip2 a file, processor freq is
pinned at 1.8GHz and drops to 1GHz when idle.

--- [1]

$ cat /proc/cpuinfo
processor : 0
vendor_id : AuthenticAMD
cpu family : 15
model : 31
model name : AMD Athlon(tm) 64 Processor 3000+
stepping : 0
cpu MHz : 1004.646
cache size : 512 KB
fpu : yes
fpu_exception : yes
cpuid level : 1
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge
mca cmov pat pse36 clflush mmx fxsr sse sse2 syscall nx mmxext
fxsr_opt lm 3dnowext 3dnow
bogomips : 1988.83
TLB size : 1024 4K pages
clflush size : 64
cache_alignment : 64
address sizes : 40 bits physical, 48 bits virtual
power management: ts fid vid ttp

Oliver Weihe wrote:
> Hello,
>
> I've two Iwill 8way Opteron equipped with 8 Opteron 875 CPUs each.
> (In the past we build some systems with singlecore CPUs and they went
> very well)
>
> The Problem now is that the machines crash during boot when maxcpus is
> greater than 8.
> 2.6.12-rc4 works well with maxcpus=8, with 9 or more it freezes after
> "Testing NMI Watchdog... OK"
>
> 2.6.12-rc5 and above have more problems even with maxcpus=4 or less very
> early during booting.
>
> 2.6.13-X crashes later during boot (from 2 to 16 cores it's the same
> behavior)
>
> The last I can so on the console (kernel 2.6.13-rc2-git4, maxcpus=2..16)
> is:
>
> NET: Registered protocol family 1
> Using IPI Shortcut mode
> int3: 0000 [1] SMP
> CPU4
> Modules linked in:
> Freeing unused kernel memory: 212k freed
> Pid: 0, comm: swapper Not tainted 2.6.13-rc2-git4-default
> RIP: 0010:[<ffffffff8050fc00>]
>
> After that the machines are totally freezed.
>
> With maxcpus=1 all (tested) versions >=2.6.12-rc3 are able to boot.
>
> Any hints/ideas/what ever?
>
> Regards,
> Oliver Weihe
>
> P.S. if you answer CC me ;)
___
Daniel J Blueman