Messages in this thread | | | Date | Wed, 04 Aug 2004 18:35:24 +1000 | From | Nick Piggin <> | Subject | Re: 2.6.8-rc2-mm2 |
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Con Kolivas wrote: > Con Kolivas writes: > >> Nick Piggin writes: >> >>> Con Kolivas wrote: >>> >>>> Andrew Morton wrote: >>> >>> >>>> Anyone with feedback on this please cc me. This was developed >>>> separately from the -mm series which has heaps of other scheduler >>>> patches which were not trivial to merge with so there may be >>>> teething problems. Good reports dont hurt either ;) >>>> >>> >>> I can't get onto the OSDL site now, but I seem to remember staircase >>> having some performance problems on a few things. Hackbench and reaim >>> from memory... are these fixed? was I dreaming? >> >> >> Definitely dreaming I'm afraid :D >> >> The performance on both reaim and hackbench has always equalled or >> exceeded mainline so thanks for bringing it up.
(OSDL's search thingy still isn't working quite right, but I'll get back to you about this when it does.)
Otherwise, a couple of problems I noticed:
You removed things like this: - /* - * The idle thread is not allowed to schedule! - * Remove this check after it has been exercised a bit. - */ - if (unlikely(current == rq->idle) && current->state != TASK_RUNNING) { - printk(KERN_ERR "bad: scheduling from the idle thread!\n"); - dump_stack(); - } - And child-runs-first in wake_up_new_task. Please don't.
Also, basic interactivity in X is bad with the interactive sysctl set to 0 (is X supposed to be at nice 0?), however fairness is bad when interactive is 1. I'm not sure if this is an acceptable tradeoff - are you planning to fix it?
It has interactivity problems with "thud". Also the mouse can freeze for .5 to 1 second when moving between windows while there is disk IO going on in the background (this is with interactive = 1). The test-starve problem is back.
Increasing priority (negative nice) doesn't have much impact. -20 CPU hog only gets about double the CPU of a 0 priority CPU hog and only about 120% the CPU time of a nice -10 hog. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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