Messages in this thread | | | Subject | Re: Issues with Patch: "sched: Improve latencies and throughput" | From | Mike Galbraith <> | Date | Thu, 01 Apr 2010 07:49:46 +0200 |
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On Thu, 2010-04-01 at 00:31 +0200, Michael Grzeschik wrote: > We are using an arm mx31 embedded cpu with the v2.6.34 Kernelrelease and > realized some issues with the scheduling behaviour the patch "sched: > Improve latencies and throughput" [1] by Mike Galbraith introduced to > the kernel. > > When we used the alsa utility aplay to pipe some audio through an > usbaudio device and put some scheduling overhead on the device, the > amount of underruns, due to the not fast enough refilled ring buffer, > was noticable increased with that patch [1] applied. Until we reverse > applied the patch the amount of underruns was appreciable lower.
Testcase?
> That in fact is the opposite behaviour to its actual meaning.
Not necessarily. NEXT_BUDDY can increase latency for waiters, as can _not_ pulling a waiter to an idle CPU.
> [1] 0ec9fab3d186d9cbb00c0f694d4a260d07c198d9 > > mgr
-Mike
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