Messages in this thread | | | Subject | Re: [patch] voluntary-preempt-2.6.8-rc3-O4 | From | Lee Revell <> | Date | Mon, 09 Aug 2004 13:06:09 -0400 |
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On Mon, 2004-08-09 at 13:02, Florian Schmidt wrote:
> I don't use APIC, since it never worked good for me.. But i wanted to > report that the mlockall latency still seems to be there.. I can easily > trigger it with mlockall'ing > ~10000kb. Need to recompile with the > preempt-timing patch, but here's an xrun trace that happened when > mlockall'ing 20000kb: >
Ingo, do you plan to maintain the voluntary preempt patch against the -mm series? From looking at Andrew's announcement yesterday it looks like many latency issues fixed in the voluntary preemption patches are also fixed in -mm, so it seems like the patch would be much smaller. One thing that might be useful is breaking out the irq threading code as a patch against -mm. Judging from all the -mm latency fixes it seems like this would work as well as the vanilla kernel+voluntary preempt.
This would also make it easier to identify which are the important latency fixes from -mm enabling them to be pushed into mainline sooner. On some of my tests I got 10-20% better results using vol-preempt+mm vs vol-preempt+vanilla, it would be nice to identify what changes are responsible.
Lee
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