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

Nakajima, Jun
2004-03-25T15:33:08Z

Andi,

Can you be more specific with "it doesn't load balance threads
aggressively enough"? Or what behavior of the base NUMA scheduler is
missing in the sched-domain scheduler especially for NUMA?

Jun

>-----Original Message-----
>From: Andi Kleen [mailto:ak@suse.de]
>Sent: Thursday, March 25, 2004 3:47 AM
>To: Rick Lindsley
>Cc: Andi Kleen; Ingo Molnar; piggin@cyberone.com.au; linux-
>kernel@vger.kernel.org; akpm@osdl.org; kernel@kolivas.org;
>rusty@rustcorp.com.au; Nakajima, Jun; 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, Mar 25, 2004 at 03:40:22AM -0800, Rick Lindsley wrote:
>> 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, I've got some schedstat code which may help us to understand
why.
>> I'll need to port it to Ingo's changes, but if I drop you a patch in
a
>> day or two can you try your test on sched-domain/non-sched-domain,
>> collecting the stats?
>
>The openmp failure is already pretty well understood - it doesn't load
>balance
>threads aggressively enough over CPUs after startup.
>
>-Andi