From: Ingo Molnar <mingo@elte.hu>
To: Jeff Dike <jdike@addtoit.com>
Cc: linux-kernel@vger.kernel.org,
user-mode-linux-devel@lists.sourceforge.net,
Miklos Szeredi <miklos@szeredi.hu>
Subject: Re: [uml-devel] -rt doesn't compile for UML
Date: Wed, 28 Nov 2007 19:37:06 +0100 [thread overview]
Message-ID: <20071128183706.GA3826@elte.hu> (raw)
In-Reply-To: <20071128182935.GA8048@c2.user-mode-linux.org>
* Jeff Dike <jdike@addtoit.com> wrote:
> On Wed, Nov 28, 2007 at 04:35:12PM +0100, Miklos Szeredi wrote:
> > Something like:
> >
> > dd if=/host/tmp/bigfile of=/tmp/bigfile bs=1048576 count=100
> >
> > and run 'top' or 'watch something' in another terminal, which
> > sometimes completely stops updating during the write.
>
> Are you talking about missing updates for a few seconds, or for
> longer? With the common above, with top -delay 1, and with 600M of
> data, I'm seeing occasional 2-3 pauses, with one missing 5 seconds.
even sub-second delays are a huge issue if the system is otherwise idle
- it signals some sort of missed event condition. scheduling must be
instantenous.
Ingo
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WARNING: multiple messages have this Message-ID (diff)
From: Ingo Molnar <mingo@elte.hu>
To: Jeff Dike <jdike@addtoit.com>
Cc: Miklos Szeredi <miklos@szeredi.hu>,
user-mode-linux-devel@lists.sourceforge.net,
linux-kernel@vger.kernel.org
Subject: Re: -rt doesn't compile for UML
Date: Wed, 28 Nov 2007 19:37:06 +0100 [thread overview]
Message-ID: <20071128183706.GA3826@elte.hu> (raw)
In-Reply-To: <20071128182935.GA8048@c2.user-mode-linux.org>
* Jeff Dike <jdike@addtoit.com> wrote:
> On Wed, Nov 28, 2007 at 04:35:12PM +0100, Miklos Szeredi wrote:
> > Something like:
> >
> > dd if=/host/tmp/bigfile of=/tmp/bigfile bs=1048576 count=100
> >
> > and run 'top' or 'watch something' in another terminal, which
> > sometimes completely stops updating during the write.
>
> Are you talking about missing updates for a few seconds, or for
> longer? With the common above, with top -delay 1, and with 600M of
> data, I'm seeing occasional 2-3 pauses, with one missing 5 seconds.
even sub-second delays are a huge issue if the system is otherwise idle
- it signals some sort of missed event condition. scheduling must be
instantenous.
Ingo
next prev parent reply other threads:[~2007-11-28 18:37 UTC|newest]
Thread overview: 68+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-11-28 12:47 [uml-devel] -rt doesn't compile for UML Miklos Szeredi
2007-11-28 12:47 ` Miklos Szeredi
2007-11-28 12:50 ` [uml-devel] " Ingo Molnar
2007-11-28 12:50 ` Ingo Molnar
2007-11-28 13:09 ` [uml-devel] " Miklos Szeredi
2007-11-28 13:09 ` Miklos Szeredi
2007-11-28 13:15 ` [uml-devel] " Ingo Molnar
2007-11-28 13:15 ` Ingo Molnar
2007-11-28 13:15 ` [uml-devel] " Ingo Molnar
2007-11-28 13:15 ` Ingo Molnar
2007-11-28 13:24 ` [uml-devel] " Miklos Szeredi
2007-11-28 13:24 ` Miklos Szeredi
2007-11-28 15:08 ` [uml-devel] " Jeff Dike
2007-11-28 15:08 ` Jeff Dike
2007-11-28 15:38 ` [uml-devel] " Miklos Szeredi
2007-11-28 15:38 ` Miklos Szeredi
2007-11-28 15:41 ` [uml-devel] " Ingo Molnar
2007-11-28 15:41 ` Ingo Molnar
2007-11-28 16:00 ` [uml-devel] " Miklos Szeredi
2007-11-28 16:00 ` Miklos Szeredi
2007-11-28 16:05 ` [uml-devel] " Ingo Molnar
2007-11-28 16:05 ` Ingo Molnar
2007-11-28 16:57 ` [uml-devel] " Miklos Szeredi
2007-11-28 16:57 ` Miklos Szeredi
2007-11-28 17:02 ` [uml-devel] " Ingo Molnar
2007-11-28 17:02 ` Ingo Molnar
2007-11-28 17:02 ` [uml-devel] " Miklos Szeredi
2007-11-28 17:02 ` Miklos Szeredi
2007-11-28 17:24 ` [uml-devel] " Ingo Molnar
2007-11-28 17:24 ` Ingo Molnar
2007-11-28 17:25 ` [uml-devel] " Miklos Szeredi
2007-11-28 17:25 ` Miklos Szeredi
2007-11-28 17:38 ` [uml-devel] " Jeff Dike
2007-11-28 17:38 ` Jeff Dike
2007-11-28 15:06 ` [uml-devel] " Jeff Dike
2007-11-28 15:06 ` Jeff Dike
2007-11-28 15:35 ` [uml-devel] " Miklos Szeredi
2007-11-28 15:35 ` Miklos Szeredi
2007-11-28 18:29 ` [uml-devel] " Jeff Dike
2007-11-28 18:29 ` Jeff Dike
2007-11-28 18:37 ` Ingo Molnar [this message]
2007-11-28 18:37 ` Ingo Molnar
2007-11-28 18:46 ` [uml-devel] " Miklos Szeredi
2007-11-28 18:46 ` Miklos Szeredi
2007-11-29 10:19 ` [uml-devel] scheduling anomaly on uml (was: -rt doesn't compile for UML) Miklos Szeredi
2007-11-29 10:19 ` Miklos Szeredi
2007-11-29 10:57 ` [uml-devel] " Ingo Molnar
2007-11-29 10:57 ` Ingo Molnar
2007-11-29 11:36 ` [uml-devel] " Miklos Szeredi
2007-11-29 11:36 ` Miklos Szeredi
2007-11-29 11:50 ` [uml-devel] " Ingo Molnar
2007-11-29 11:50 ` Ingo Molnar
2007-11-29 16:07 ` [uml-devel] " Miklos Szeredi
2007-11-29 16:07 ` Miklos Szeredi
2007-11-29 16:25 ` [uml-devel] " Ingo Molnar
2007-11-29 16:25 ` Ingo Molnar
2007-11-29 18:05 ` [uml-devel] " Miklos Szeredi
2007-11-29 18:05 ` Miklos Szeredi
2007-11-29 19:26 ` [uml-devel] " Ingo Molnar
2007-11-29 19:26 ` Ingo Molnar
2007-11-29 17:02 ` [uml-devel] " Jeff Dike
2007-11-29 17:02 ` Jeff Dike
2007-11-29 17:16 ` [uml-devel] " Ingo Molnar
2007-11-29 17:16 ` Ingo Molnar
2007-11-29 17:58 ` [uml-devel] " Miklos Szeredi
2007-11-29 17:58 ` Miklos Szeredi
2007-11-30 19:44 ` [uml-devel] " Miklos Szeredi
2007-11-30 19:44 ` Miklos Szeredi
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