Messages in this thread | | | Date | Mon, 17 Nov 2003 16:17:00 +1100 | From | Nick Piggin <> | Subject | Re: Terrible interactivity with 2.6.0-t9-mm3 |
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Gene Heskett wrote:
>On Sunday 16 November 2003 23:19, Nick Piggin wrote: > >>I think you might have confused Andrew a bit more ;) >> >>To start with, you are talking about IO schedulers, while the thread >>is about CPU interactivity. >> > >I wasn't aware that such performance issues were divorced. In my >admitted limited view, a laggy mouse is a laggy mouse, and its due to >irq latency in achieving the context switch to service the mouses >data. To me, its sorta like 2=2. :) >
I guess its mostly due to scheduling latency. I think IRQ latency is generally very good these days.
Scheduling latency caused not by long critical sections in the kernel, but having things scheduled in front of you (X) for a long time.
> >>The problem here looks like something that is caused by something in >>mm3, not in mm2, not linus.patch, and not >>context-switch-accounting-fix.patch. >> >> >>Off topic: it would be good if you could try the as disk scheduler >>in mm3. I recall you had some problems with it earlier, but they >>should be fixed in mm3. Thanks. >> > >Ok Nick. I'll reboot tomorrow without the elevator argument. Right >now, amanda is fixin to be fired off in about 25 minutes and I want >to see how badly its estimate phase hogs the machine using the cfq >scheduler. With the -mm2 as, it was almost psychedelic to watch the >mouse move. >
OK thanks. I think this problem you were seeing _was_ interrupt latency due to AS doing millions of WARNs. It should be fixed in mm3.
> >Also off topic re mouse performance, and I expect this is an X issue, >but when its been blanked because I'm typing, it takes about a full >seconds worth of hand waving before it becomes visible again. This >is an X issue and I should go away, right? >
Sounds like it.
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