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From: Ingo Molnar <mingo@elte.hu>
To: Ray Lee <ray-lk@madrabbit.org>
Cc: "Carlos R. Mafra" <crmafra2@gmail.com>,
	kernel list <linux-kernel@vger.kernel.org>,
	Arjan van de Ven <arjan@infradead.org>
Subject: Re: Interactivity issue in 2.6.25-rc3
Date: Fri, 29 Feb 2008 16:57:41 +0100	[thread overview]
Message-ID: <20080229155741.GF27248@elte.hu> (raw)
In-Reply-To: <2c0942db0802281328y276d110cqbcc9cfe92f0c6832@mail.gmail.com>


* Ray Lee <ray-lk@madrabbit.org> wrote:

> But it's good to keep in mind that the scheduler can't do anything 
> about slowdowns due to tasks being swapped out or waiting on reads 
> from the disk. I mention this as shortly after CFS got into mainline, 
> something changed in the VM that seems to make my system spend a lot 
> more time in IO wait, causing the system to be much less responsive 
> than it used to be.
> 
> Unfortunately it seems to be dependent upon the history of what tasks 
> I've run and their memory usage, so it's been hard to come up with a 
> reproducible test case (well that and a complete lack of time). All I 
> can say is that I've seen what you've reported as well, though it had 
> nothing to do with using any 3d applications, just a browser, editor, 
> gcc, etc.

what does latencytop say about those delays, what causes them? It should 
be able to capture all sorts of latency sources in the system.

	Ingo

  reply	other threads:[~2008-02-29 15:58 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-02-28 18:44 Carlos R. Mafra
2008-02-28 19:18 ` Ingo Molnar
2008-02-28 19:54   ` Ray Lee
     [not found]     ` <20080228210627.GA4337@localhost.ift.unesp.br>
2008-02-28 21:28       ` Ray Lee
2008-02-29 15:57         ` Ingo Molnar [this message]
2008-02-29 18:33           ` Ray Lee
2008-02-29 16:04       ` Ingo Molnar
2008-02-29 17:14         ` Carlos R. Mafra
2008-02-29 18:36           ` Ingo Molnar
2008-02-28 21:21 Carlos R. Mafra

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