From: Ingo Molnar <mingo@elte.hu>
To: Chris Friesen <cfriesen@nortel.com>
Cc: Jarek Poplawski <jarkao2@o2.pl>,
Nick Piggin <nickpiggin@yahoo.com.au>,
David Schwartz <davids@webmaster.com>,
linux-kernel@vger.kernel.org, Mike Galbraith <efault@gmx.de>,
Peter Zijlstra <a.p.zijlstra@chello.nl>,
Martin Michlmayr <tbm@cyrius.com>,
Srivatsa Vaddagiri <vatsa@linux.vnet.ibm.com>,
Stephen Hemminger <shemminger@linux-foundation.org>
Subject: Re: Network slowdown due to CFS
Date: Mon, 1 Oct 2007 19:09:03 +0200 [thread overview]
Message-ID: <20071001170903.GA2492@elte.hu> (raw)
In-Reply-To: <47012696.2010606@nortel.com>
* Chris Friesen <cfriesen@nortel.com> wrote:
> Ingo Molnar wrote:
>
> >But, because you assert it that it's risky to "criticise sched_yield()
> >too much", you sure must know at least one real example where it's right
> >to use it (and cite the line and code where it's used, with
> >specificity)?
>
> It's fine to criticise sched_yield(). I agree that new apps should
> generally be written to use proper completion mechanisms or to wait
> for specific events.
yes.
> However, there are closed-source and/or frozen-source apps where it's
> not practical to rewrite or rebuild the app. Does it make sense to
> break the behaviour of all of these?
See the background and answers to that in:
http://lkml.org/lkml/2007/9/19/357
http://lkml.org/lkml/2007/9/19/328
there's plenty of recourse possible to all possible kinds of apps. Tune
the sysctl flag in one direction or another, depending on which behavior
the app is expecting.
Ingo
next prev parent reply other threads:[~2007-10-01 17:09 UTC|newest]
Thread overview: 71+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-09-26 8:52 Network slowdown due to CFS Martin Michlmayr
2007-09-26 9:34 ` Ingo Molnar
2007-09-26 9:47 ` Ingo Molnar
2007-09-26 10:08 ` Martin Michlmayr
2007-09-26 10:18 ` Ingo Molnar
2007-09-26 10:20 ` Mike Galbraith
2007-09-26 10:23 ` Mike Galbraith
2007-09-26 10:48 ` Martin Michlmayr
2007-09-26 11:21 ` Ingo Molnar
2007-09-26 11:29 ` Martin Michlmayr
2007-09-26 12:00 ` David Schwartz
2007-09-26 13:31 ` Ingo Molnar
2007-09-26 15:40 ` Stephen Hemminger
2007-09-26 15:46 ` Stephen Hemminger
2007-09-27 9:30 ` Jarek Poplawski
2007-09-27 9:46 ` Ingo Molnar
2007-09-27 12:27 ` Jarek Poplawski
2007-09-27 13:31 ` Ingo Molnar
2007-09-27 14:42 ` Jarek Poplawski
2007-09-28 6:10 ` Nick Piggin
2007-10-01 8:43 ` Jarek Poplawski
2007-10-01 16:25 ` Ingo Molnar
2007-10-01 16:49 ` David Schwartz
2007-10-01 17:31 ` Ingo Molnar
2007-10-01 18:23 ` David Schwartz
2007-10-02 6:06 ` Ingo Molnar
2007-10-02 6:47 ` Andi Kleen
2007-10-03 8:02 ` Jarek Poplawski
2007-10-03 8:16 ` Ingo Molnar
2007-10-03 8:56 ` Jarek Poplawski
2007-10-03 9:10 ` Ingo Molnar
2007-10-03 9:50 ` Jarek Poplawski
2007-10-03 10:55 ` Dmitry Adamushko
2007-10-03 10:58 ` Dmitry Adamushko
2007-10-03 11:20 ` Jarek Poplawski
2007-10-03 11:22 ` Ingo Molnar
2007-10-03 11:40 ` Jarek Poplawski
2007-10-03 11:56 ` yield Ingo Molnar
2007-10-03 12:16 ` yield Jarek Poplawski
2007-10-07 7:18 ` Network slowdown due to CFS Ingo Molnar
2007-10-04 5:33 ` Casey Dahlin
2007-10-02 6:08 ` Ingo Molnar
2007-10-02 6:26 ` Ingo Molnar
2007-10-02 6:46 ` yield API Ingo Molnar
2007-10-02 11:50 ` linux-os (Dick Johnson)
2007-10-02 15:24 ` Douglas McNaught
2007-10-02 21:57 ` Eric St-Laurent
2007-12-12 22:39 ` Jesper Juhl
2007-12-13 4:43 ` Kyle Moffett
2007-12-13 20:10 ` David Schwartz
2007-10-01 19:53 ` Network slowdown due to CFS Arjan van de Ven
2007-10-01 22:17 ` David Schwartz
2007-10-01 22:35 ` Arjan van de Ven
2007-10-01 22:44 ` David Schwartz
2007-10-01 22:55 ` Arjan van de Ven
2007-10-02 15:37 ` David Schwartz
2007-10-03 7:15 ` Jarek Poplawski
2007-10-03 11:31 ` Helge Hafting
2007-10-04 0:31 ` Rusty Russell
2007-10-01 16:55 ` Chris Friesen
2007-10-01 17:09 ` Ingo Molnar [this message]
2007-10-01 17:45 ` Chris Friesen
2007-10-01 19:09 ` iperf yield usage Ingo Molnar
2007-10-02 9:03 ` Network slowdown due to CFS Jarek Poplawski
2007-10-02 13:39 ` Jarek Poplawski
2007-10-02 9:26 ` Jarek Poplawski
2007-09-27 9:49 ` Ingo Molnar
2007-09-27 10:54 ` Martin Michlmayr
2007-09-27 10:56 ` Ingo Molnar
2007-09-27 11:12 ` Martin Michlmayr
-- strict thread matches above, loose matches on Subject: below --
2007-10-01 22:27 Hubert Tonneau
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