On Tue, 2007-09-25 at 09:35 +0200, Mike Galbraith wrote:
> Darn, have news: latency thing isn't dead. Two busy loops, one at nice
> 0 pinned to CPU0, and one at nice 19 pinned to CPU1 produced the
> latencies below for nice -5 Xorg. Didn't kill the box though.
>
> se.wait_max : 10.068169
> se.wait_max : 7.465334
> se.wait_max : 135.501816
> se.wait_max : 0.884483
> se.wait_max : 144.218955
> se.wait_max : 128.578376
> se.wait_max : 93.975768
> se.wait_max : 4.965965
> se.wait_max : 113.655533
> se.wait_max : 4.301075
>
> sched_debug (attached) is.. strange.
Disabling CONFIG_FAIR_GROUP_SCHED fixed both. Latencies of up to 336ms
hit me during the recompile (make -j3), with nothing else running.
Since reboot, latencies are, so far, very very nice. I'm leaving it
disabled for now.
-Mike
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