RE: [Lse-tech] [patch] sched-domain cleanups, sched-2.6.5-rc2-mm2-A3

Martin J. Bligh
2004-03-25T16:54:18Z

> We have found some performance regressions (e.g. SPECjbb) with the
> scheduler on a large IA-64 NUMA machine, and we are debugging it. On SMP
> machines, we haven't seen performance regressions.

Is this the SPECjbb / Java thing that believes that sched_yield is a
stable locking primitive? If so, it needs to be ignored ;-) That's
the problem we had here, at least ...

M.

> Jun
>
>> -----Original Message-----
>> From: Andi Kleen [mailto:ak@suse.de]
>> Sent: Wednesday, March 24, 2004 8:56 PM
>> To: Ingo Molnar
>> Cc: piggin@cyberone.com.au; linux-kernel@vger.kernel.org;
> akpm@osdl.org;
>> kernel@kolivas.org; rusty@rustcorp.com.au; Nakajima, Jun;
>> ricklind@us.ibm.com; anton@samba.org; lse-tech@lists.sourceforge.net;
>> mbligh@aracnet.com
>> Subject: Re: [Lse-tech] [patch] sched-domain cleanups,
> sched-2.6.5-rc2-mm2-
>> A3
>>
>> On Thu, 25 Mar 2004 09:28:09 +0100
>> Ingo Molnar <mingo@elte.hu> wrote:
>>
>>> i've reviewed the sched-domains balancing patches for upstream
> inclusion
>>> and they look mostly fine.
>>
>> The main problem it has is that it performs quite badly on Opteron NUMA
>> e.g. in the OpenMP STREAM test (much worse than the normal scheduler)
>>
>> -Andi
>
>