From: Ingo Molnar <mingo@elte.hu>
To: James Morris <jmorris@namei.org>
Cc: Matt Mackall <mpm@selenic.com>,
Rusty Russell <rusty@rustcorp.com.au>,
akpm@linux-foundation.org, Linux-kernel@vger.kernel.org
Subject: Re: Interesting interaction between lguest and CFS
Date: Mon, 4 Jun 2007 22:24:05 +0200 [thread overview]
Message-ID: <20070604202405.GA27632@elte.hu> (raw)
In-Reply-To: <Line.LNX.4.64.0706041613310.13341@d.namei>
* James Morris <jmorris@namei.org> wrote:
> On Mon, 4 Jun 2007, Ingo Molnar wrote:
>
> > perhaps lguest does something unusual when it idles? Does it fiddle
> > sched_clock() in any way?
>
> One of the lguest processes calls nice(2), which seems like a long
> shot, but also not impossibly related. (Note that newer patches in
> the lguest queue remove this, so it'll depend on exactly which patches
> you have applied).
i've got 2.6.22-rc3-mm1's lguest (with a trivial boot-time crash fix in
sched_clock that i ran into). But nice(2) should only cause a gentle,
20% smaller CPU bandwidth to be allocated by CFS to that thread, nothing
more drastic like user-visible delays.
Ingo
next prev parent reply other threads:[~2007-06-04 20:24 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-06-04 17:37 Interesting interaction between lguest and CFS Matt Mackall
2007-06-04 17:54 ` Ingo Molnar
2007-06-04 18:41 ` Matt Mackall
2007-06-05 7:19 ` Ingo Molnar
2007-06-05 14:03 ` Matt Mackall
2007-06-05 15:14 ` Dmitry Adamushko
2007-06-05 15:41 ` Dmitry Adamushko
2007-06-05 19:50 ` Ingo Molnar
2007-06-06 20:23 ` Matt Mackall
2007-06-08 9:34 ` Ingo Molnar
2007-06-08 10:18 ` Ingo Molnar
2007-06-04 18:11 ` Ingo Molnar
2007-06-04 18:42 ` Matt Mackall
2007-06-04 19:12 ` Ingo Molnar
2007-06-04 19:27 ` Matt Mackall
2007-06-04 19:40 ` Ingo Molnar
2007-06-04 19:59 ` Matt Mackall
2007-06-04 20:13 ` Ingo Molnar
2007-06-04 20:20 ` Ingo Molnar
2007-06-04 20:15 ` James Morris
2007-06-04 20:24 ` Ingo Molnar [this message]
2007-06-04 22:58 ` Olof Johansson
2007-06-05 1:02 ` Rusty Russell
2007-06-05 1:24 ` Stephen Rothwell
2007-06-05 2:23 ` Olof Johansson
2007-06-05 0:18 ` Rusty Russell
2007-06-05 2:31 ` Rusty Russell
2007-06-05 4:18 ` Matt Mackall
2007-06-05 4:37 ` Rusty Russell
2007-06-05 13:49 ` Matt Mackall
2007-06-05 19:38 ` Ingo Molnar
2007-06-05 10:43 ` Ingo Molnar
2007-06-05 19:08 ` Ingo Molnar
2007-06-06 20:19 ` Matt Mackall
2007-06-05 2:34 ` Matt Mackall
2007-06-05 7:10 ` Ingo Molnar
2007-06-05 9:23 ` Ingo Molnar
2007-06-05 14:06 ` Matt Mackall
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