lkml.org 
[lkml]   [2003]   [Nov]   [17]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: Terrible interactivity with 2.6.0-t9-mm3


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.


-
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/

\
 
 \ /
  Last update: 2005-03-22 13:58    [W:0.142 / U:0.032 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site