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From: Nick Piggin <piggin@cyberone.com.au>
To: Johnny Yau <jyau_kernel_dev@hotmail.com>
Cc: "'Robert Love'" <rml@tech9.net>, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] Minor scheduler fix to get rid of skipping in xmms
Date: Sun, 07 Sep 2003 18:10:21 +1000	[thread overview]
Message-ID: <3F5AE7ED.7010501@cyberone.com.au> (raw)
In-Reply-To: <Law10-OE296cRyiOYbp00008b23@hotmail.com>



Johnny Yau wrote:

>>Heh, your logic is entertaining. I don't know how you got from step 1
>>to step 3 ;)
>>
>
>LOL...I got a bit scatterbrained.  My basic argument is the fewer context
>switches while maintaining interactivity the better because it's less
>overhead and less cache thrashing.  If we don't care about the overhead and
>thrashing at all, then might as well be very aggressive with the scheduler
>and use uniform 1 ms timeslices in a RR fashion.  I've coded such a
>scheduler in an embedded systems context; response time is awesome, but I
>highly doubt it'd work for Linux workloads.
>

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.



  reply	other threads:[~2003-09-07  8:10 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 [this message]
2003-09-07  8:35               ` John Yau
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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