Messages in this thread | | | Date | Fri, 3 Sep 2004 09:01:36 +0200 | From | Ingo Molnar <> | Subject | Re: [patch] voluntary-preempt-2.6.9-rc1-bk4-R0 |
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* Lee Revell <rlrevell@joe-job.com> wrote:
> > vanilla kernel 2.6.8.1 would be quite interesting to get a few charts of > > - especially if your measurement methodology has changed. > > OK, I will give this a shot. Now that the VP patches are stabilizing > I will be doing more profiling. I also want to try the -mm kernel, > this has some interesting differences from the stock kernel. For > example I measured about a 10% improvement with the old method, which > implies a big performance gain.
the -mm kernel used to have additional *-latency-fix patches that were done based on the initial preemption-timing patch in -mm and partly based on early VP discussions and findings. I recently reviewed and merged the 2-3 missing ones into VP. Andrew has dropped these patches meanwhile and i expect to submit the cleaner and more complete solution that is in VP.
So i'd expect -mm to still perform better than vanilla (it usually does), but if that big 10% difference in latencies doesnt show up anymore i'd attribute it to the shuffling around of latency related patches, not some genuine deficiency in -mm.
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