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Date: Mon, 03 Mar 2003 23:48:07 -0800
From: "Martin J. Bligh" <mbligh@aracnet.com>
To: Con Kolivas <kernel@kolivas.org>,
       linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: xmms (audio) skipping in 2.5 (not 2.4)
Message-ID: <107450000.1046764086@[10.10.2.4]>
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>> >> So ... is there any easy way I can diagnose this? Does anyone else
>> >> have a similar problem?
>> > 
>> > Most of us who have worked with an O(1) scheduler based kernel have
>> > found this  at various times. See the previous discussion with akpm
>> > about the interactivity estimator. Akpm found that decreasing the
>> > maximum timeslice duration would blunt the effect of the interactivity
>> > estimator giving preference to the "wrong" task. In 2.4.20-ck4 I avoid
>> > this problem with the  "desktop tuning" of making the max
>> > timeslice==min timeslice. Try an -mm  kernel with the scheduler
>> > tunables patch and try playing with the max  timeslice. Most have
>> > found that <=25 will usually stop these skips. The  default max
>> > timeslice of 300ms is just too long for the desktop and interactivity
>> > estimator.
>> 
>> Heh, cool. I have the same patch in my tree too, fixed it without
>> rebooting even ;-) Still a *tiny* bit of skipping, but infinitely better
>> than it was.
> 
> Try decreasing prio_bonus_ratio to 15 as well

Doesn't seem to make much difference, actually.
But "waggle scrollbar a bit" isn't very scientific .. ;-)
Does contest (or anything else) measure this kind of thing more precisely?

M.

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