From: Robert Love <rml@tech9.net>
To: Ian Kumlien <pomac@vapor.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: [SHED] Questions.
Date: Sun, 31 Aug 2003 15:51:18 -0400 [thread overview]
Message-ID: <1062359478.1313.9.camel@boobies.awol.org> (raw)
In-Reply-To: <1062358285.5171.101.camel@big.pomac.com>
On Sun, 2003-08-31 at 15:31, Ian Kumlien wrote:
> Since they would have a high pri still, and preempt is there... it
> should be back on the cpu pretty quick.
Ah, but no! You assume we do not have an expired list and round robin
scheduling.
Once a task exhausts its timeslice, it cannot run until all other tasks
exhaust their timeslice. If this were not the case, high priority tasks
could monopolize the system.
> But, it also creates problems for when a interactive process becomes a
> cpu hog. Like this the detection should be faster, but should be slowed
> down somewhat.
I agree, although I do think it responds fairly quick. But, regardless,
this is why I am interested in Nick's work. The interactivity estimator
can never be perfect.
> But, hogs would instead cause a context switch hell and lessen the
> throughput on server loads...
Hm, why?
> I don't see how priorities would be questioned... Since, all i say is
> that a task that gets preempted should have a guaranteed time on the cpu
> so that we don't waste cycles doing context switches all the time.
But latency is important.
Robert Love
next prev parent reply other threads:[~2003-08-31 19:40 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-08-31 10:07 [SHED] Questions Ian Kumlien
2003-08-31 10:17 ` Nick Piggin
2003-08-31 10:24 ` Ian Kumlien
2003-08-31 10:41 ` Nick Piggin
2003-08-31 10:46 ` Nick Piggin
[not found] ` <1062326980.9959.65.camel@big.pomac.com>
[not found] ` <3F51D4A4.4090501@cyberone.com.au>
2003-08-31 11:08 ` Ian Kumlien
2003-08-31 11:31 ` Nick Piggin
2003-08-31 11:43 ` Ian Kumlien
2003-08-31 18:53 ` Robert Love
2003-08-31 19:31 ` Ian Kumlien
2003-08-31 19:51 ` Robert Love [this message]
2003-08-31 22:41 ` Ian Kumlien
2003-08-31 23:41 ` Robert Love
2003-09-01 0:00 ` Ian Kumlien
2003-09-01 2:50 ` Con Kolivas
2003-09-01 15:58 ` Antonio Vargas
2003-09-01 22:19 ` Ian Kumlien
2003-09-01 4:03 ` Robert Love
2003-09-01 5:07 ` Con Kolivas
2003-09-01 5:55 ` Robert Love
2003-09-01 22:24 ` Ian Kumlien
2003-09-01 14:21 ` Antonio Vargas
2003-09-01 19:36 ` Geert Uytterhoeven
2003-09-01 22:49 ` Ian Kumlien
2003-09-01 15:07 ` Daniel Phillips
2003-09-01 14:16 ` Antonio Vargas
2003-09-01 23:03 ` Ian Kumlien
2003-09-02 0:04 ` Nick Piggin
2003-09-02 0:23 ` Con Kolivas
2003-09-02 10:25 ` Ian Kumlien
2003-09-02 11:08 ` Nick Piggin
2003-09-02 17:22 ` Ian Kumlien
2003-09-02 23:49 ` Nick Piggin
2003-09-03 23:02 ` Ian Kumlien
2003-09-04 1:39 ` Mike Fedyk
2003-09-02 10:44 ` Wes Janzen
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