linux-kernel - Re: Scheduling problems ? [ Was: Linux 2.6.26-rc1 ]

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Message-ID: <20080506131100.GC2146@elte.hu>
Date:	Tue, 6 May 2008 15:11:00 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	J.A. Magallón <jamagallon@....com>
Cc:	Linux-Kernel <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: Scheduling problems ? [ Was: Linux 2.6.26-rc1 ]


* J.A. Magallón <jamagallon@....com> wrote:

> Hi...
> 
> I have installed this kernel, and it behaves a bit strange.
> 
> If I launch a movie under totem, it plays nicely (no HD, just 
> 512x384). If then I start deluge with some torrents downloading, the 
> video begins to loose frames and jump, like loosing 1 or 2 frames per 
> second. There is not much bandwidth used, just 15-20 Kb.
> 
> I have tried the same copying a kernel source tree and the video plays 
> fine. So can it be something network related, os network+io to disk ?
> 
> No group scheduling, 1000Hz, fully preemptive kernel. If you smell 
> something and need my .config I will post it.

could you try latest -git (head v2.6.26-rc1-110-ga153063 or later). 

There's scheduler interactivity fixes in it: in particular the 
fair-sleepers latency bug was finally tracked down and fixed via 
v2.6.26-rc1-66-ga992241 ("sched: fix normalized sleeper").

In v2.6.25 we didnt find that bug in time - see v2.6.25-rc9-1-ge2df9e0 
('revert "sched: fix fair sleepers"').

	Ingo
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