Messages in this thread |  | | | From | "John Yau" <> | | Subject | RE: [PATCH] Minor scheduler fix to get rid of skipping in xmms | | Date | Sat, 6 Sep 2003 18:41:52 -0400 |
| |
>The rationale behind Ingo's patch is to "break up" the timeslices to give better scheduling latency to >multiple tasks at the same priority. >So it is not "unnecessary context switches," just "extra context switches."
Hmm...my reasoning is that those switches are unnecessary because the interactivity bonus/penalty will take care of breaking the timeslices up in case of a CPU hog, albeit not at precise 25 ms granularity. Though having regularity in scheduling is nice, I think Ingo's patch somewhat negates the purpose of having heterogenous time slice lengths. I suspect Ingo's approach will thrash the caches quite a bit more than mine; we should definitely test this a bit to find out for sure. Any suggestions on how to go about that?
If we're going to do a context switch every 25 ms no matter what, we might as well just make the scheduler a true real time scheduler, dump having different time slice lengths and interactivity recalculations, and go completely round robin with strictly enforced priorities and a single class of time slice somewhere 1 to 5 ms long.
John Yau - 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/
|  |