From: "John Yau" <jyau_kernel_dev@hotmail.com>
To: "Nick Piggin" <piggin@cyberone.com.au>
Cc: <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] Minor scheduler fix to get rid of skipping in xmms
Date: Sun, 7 Sep 2003 04:35:01 -0400 [thread overview]
Message-ID: <LAW10-OE38NfztQ7LS000009f64@hotmail.com> (raw)
In-Reply-To: 3F5AE7ED.7010501@cyberone.com.au
>
> Even if context switches don't cost anything, you still want to have
> priorities so cpu hogs can be preempted by other tasks in order to
> quickly respond to IO events. You want interactive tasks to be able
> to sometimes get more cpu than cpu hogs, etc. Scheduling latency is
> only a part of it.
>
Of course priorities are still necessary =) However assuming that
interactive tasks will always finish much much earlier than hogs, it's not
really worth it to give interactive tasks any special treatment when you
have very fine timeslices.
For example you have x that will use 100 ms and y that will use 5 ms, both
of the same priority. Assuming that x entered into the queue first and y
immediately after, at 20 ms timeslice, it will be 25 ms before y finishes.
However, at 1 ms timeslice, y finishes in 10 ms.
John Yau
next prev parent reply other threads:[~2003-09-07 8:35 UTC|newest]
Thread overview: 58+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-09-06 9:46 [PATCH] Minor scheduler fix to get rid of skipping in xmms John Yau
2003-09-06 10:03 ` Michael Buesch
2003-09-06 17:01 ` Robert Love
2003-09-06 17:59 ` John Yau
2003-09-06 18:17 ` John Yau
2003-09-06 19:42 ` Rahul Karnik
2003-09-06 20:04 ` Robert Love
2003-09-06 22:41 ` John Yau
2003-09-07 2:40 ` Martin J. Bligh
2003-09-07 5:13 ` Nick Piggin
2003-09-07 7:48 ` Johnny Yau
2003-09-07 8:10 ` Nick Piggin
2003-09-07 8:35 ` John Yau [this message]
2003-09-07 9:26 ` Nick Piggin
2003-09-07 17:30 ` John Yau
2003-09-07 17:36 ` Nick Piggin
2003-09-08 0:22 ` Con Kolivas
2003-09-08 0:27 ` David Lang
2003-09-08 0:47 ` Con Kolivas
2003-09-07 5:08 ` Nick Piggin
2003-09-07 6:18 ` Andrew Morton
2003-09-07 6:29 ` Nick Piggin
2003-09-07 6:45 ` Andrew Morton
2003-09-07 6:59 ` Nick Piggin
2003-09-07 7:02 ` Nick Piggin
2003-09-07 14:32 ` Martin J. Bligh
2003-09-07 17:02 ` Robert Love
2003-09-07 17:34 ` Andrew Morton
2003-09-07 18:12 ` Nick Piggin
2003-09-07 18:13 ` Nick Piggin
2003-09-06 15:58 John Yau
2003-09-06 16:57 ` Michael Buesch
2003-09-08 22:27 Steven Pratt
2003-09-08 22:56 ` Andrew Morton
2003-09-08 23:22 ` William Lee Irwin III
2003-09-09 2:10 ` Con Kolivas
2003-09-09 2:16 ` Con Kolivas
2003-09-09 2:31 ` Con Kolivas
2003-09-09 2:33 ` Andrew Morton
2003-09-09 4:14 ` Nick Piggin
2003-09-09 6:49 ` Con Kolivas
2003-09-09 23:53 ` Cliff White
2003-09-10 2:12 ` Nick Piggin
2003-09-10 19:05 ` Steven Pratt
2003-09-10 20:23 ` Dave Hansen
[not found] ` <3F5FE385.10204@cyberone.com.au>
[not found] ` <3F607E62.3010903@austin.ibm.com>
[not found] ` <3F60873B.4000005@cyberone.com.au>
2003-09-11 22:57 ` Steven Pratt
2003-09-11 0:14 ` Cliff White
2003-09-09 22:06 ` Steven Pratt
2003-09-09 22:12 ` Andrew Morton
2003-09-10 13:59 ` Steven Pratt
2003-09-10 18:51 ` Steven Pratt
[not found] <tCPY.4xU.1@gated-at.bofh.it>
[not found] ` <tDsR.5tY.31@gated-at.bofh.it>
[not found] ` <tZ0f.49P.5@gated-at.bofh.it>
[not found] ` <tZjz.4Bn.7@gated-at.bofh.it>
2003-09-09 23:24 ` David Mosberger-Tang
2003-09-11 2:55 Andrew Theurer
2003-09-11 11:04 ` Nick Piggin
2003-09-11 13:05 ` Andrew Theurer
2003-09-11 13:53 ` Nick Piggin
2003-09-11 14:37 ` Andrew Theurer
2003-09-11 23:32 Craig Thomas
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