From: Maximilian Engelhardt <maxi@daemonizer.de>
To: Ingo Molnar <mingo@elte.hu>
Cc: Stephen Hemminger <shemminger@linux-foundation.org>,
Thomas Gleixner <tglx@linutronix.de>,
Ulrich Drepper <drepper@gmail.com>, Michael Buesch <mb@bu3sch.de>,
linux-kernel <linux-kernel@vger.kernel.org>,
linux-wireless <linux-wireless@vger.kernel.org>,
Arnaldo Carvalho de Melo <acme@ghostprotocols.net>,
Jeff Garzik <jgarzik@pobox.com>,
Gary Zambrano <zambrano@broadcom.com>,
netdev@vger.kernel.org, Andrew Morton <akpm@linux-foundation.org>
Subject: Re: iperf: performance regression (was b44 driver problem?)
Date: Mon, 4 Jun 2007 21:47:59 +0200 [thread overview]
Message-ID: <200706042148.02450.maxi@daemonizer.de> (raw)
In-Reply-To: <20070604193206.GA13271@elte.hu>
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On Monday 04 June 2007, Ingo Molnar wrote:
> * Stephen Hemminger <shemminger@linux-foundation.org> wrote:
> > Yes, the following patch makes iperf work better than ever. But are
> > other broken applications going to have same problem. Sounds like the
> > old "who runs first" fork() problems.
>
> this is the first such app and really, and even for this app: i've been
> frequently running iperf on -rt kernels for _years_ and never noticed
> how buggy its 'locking' code was, and that it would under some
> circumstances use up the whole CPU on high-res timers.
I must admit I don't know much about that topic, but there is one thing I
don't understand. Why is iperf (even if it's buggy) able to use up the whole
cpu? I didn't run it as root but as my normal user so it should have limited
rights. Shouldn't the linux scheduler distribute cpu time among all running
processes?
Maxi
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next prev parent reply other threads:[~2007-06-04 19:48 UTC|newest]
Thread overview: 49+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-05-26 0:24 b44: regression in 2.6.22 Stephen Hemminger
2007-05-26 3:51 ` Gary Zambrano
2007-05-26 17:01 ` Michael Buesch
[not found] ` <200705261901.18110.mb-fseUSCV1ubazQB+pC5nmwQ@public.gmane.org>
2007-05-27 19:25 ` b44: regression in 2.6.22 (resend) Maximilian Engelhardt
[not found] ` <200705272125.25506.maxi-OwNUvPV92VfddJNmlsFzeA@public.gmane.org>
2007-05-27 19:45 ` Michael Buesch
[not found] ` <200705272145.00796.mb-fseUSCV1ubazQB+pC5nmwQ@public.gmane.org>
2007-05-27 20:36 ` Maximilian Engelhardt
[not found] ` <200705272236.42628.maxi-OwNUvPV92VfddJNmlsFzeA@public.gmane.org>
2007-05-27 20:46 ` Michael Buesch
[not found] ` <200705272246.16960.mb-fseUSCV1ubazQB+pC5nmwQ@public.gmane.org>
2007-05-27 21:46 ` Maximilian Engelhardt
2007-05-27 21:13 ` Michael Buesch
2007-05-27 21:16 ` Michael Buesch
[not found] ` <200705272316.07338.mb-fseUSCV1ubazQB+pC5nmwQ@public.gmane.org>
2007-05-27 21:50 ` Maximilian Engelhardt
[not found] ` <200705272313.33129.mb-fseUSCV1ubazQB+pC5nmwQ@public.gmane.org>
2007-05-27 22:15 ` Maximilian Engelhardt
2007-05-28 0:24 ` Michael Buesch
[not found] ` <200705280224.40506.mb-fseUSCV1ubazQB+pC5nmwQ@public.gmane.org>
2007-05-28 0:40 ` Maximilian Engelhardt
[not found] ` <200705280240.17910.maxi-OwNUvPV92VfddJNmlsFzeA@public.gmane.org>
2007-05-28 10:16 ` Michael Buesch
[not found] ` <200705281216.51690.mb-fseUSCV1ubazQB+pC5nmwQ@public.gmane.org>
2007-05-28 14:09 ` Maximilian Engelhardt
[not found] ` <200705281609.49859.maxi-OwNUvPV92VfddJNmlsFzeA@public.gmane.org>
2007-05-28 15:14 ` Michael Buesch
[not found] ` <200705281714.25841.mb-fseUSCV1ubazQB+pC5nmwQ@public.gmane.org>
2007-05-28 15:32 ` Thomas Gleixner
2007-05-28 15:43 ` Michael Buesch
2007-05-28 17:44 ` Maximilian Engelhardt
2007-05-28 19:23 ` Thomas Gleixner
2007-05-28 20:55 ` Maximilian Engelhardt
2007-05-28 21:45 ` Thomas Gleixner
2007-05-29 18:28 ` Maximilian Engelhardt
[not found] ` <200705282255.56490.maxi-OwNUvPV92VfddJNmlsFzeA@public.gmane.org>
2007-05-29 13:58 ` Gary Zambrano
[not found] ` <1180447123.17146.4.camel-opBMJL+S1+nCw/J+WP9nZ0NK2P1VvzQgpWgKQ6/u3Fg@public.gmane.org>
2007-05-29 17:23 ` Maximilian Engelhardt
2007-06-03 16:26 ` Maximilian Engelhardt
[not found] ` <200706031826.06891.maxi-OwNUvPV92VfddJNmlsFzeA@public.gmane.org>
2007-06-04 6:39 ` Thomas Gleixner
2007-06-04 16:09 ` Stephen Hemminger
2007-06-04 16:35 ` Thomas Gleixner
2007-06-04 16:59 ` iperf: performance regression (was b44 driver problem?) Stephen Hemminger
2007-06-04 17:32 ` Thomas Gleixner
2007-06-04 17:51 ` Stephen Hemminger
2007-06-04 19:00 ` Thomas Gleixner
2007-06-04 19:26 ` Thomas Gleixner
2007-06-04 19:32 ` Ingo Molnar
2007-06-04 19:47 ` Maximilian Engelhardt [this message]
2007-06-04 20:02 ` Stephen Hemminger
2007-06-04 20:52 ` Maximilian Engelhardt
2007-05-28 10:49 ` b44: regression in 2.6.22 (resend) Michael Buesch
[not found] ` <200705281249.56106.mb-fseUSCV1ubazQB+pC5nmwQ@public.gmane.org>
2007-05-28 14:12 ` Maximilian Engelhardt
2007-05-28 14:55 ` Michael Buesch
2007-05-29 14:14 ` Gary Zambrano
[not found] ` <1180448075.17146.12.camel-opBMJL+S1+nCw/J+WP9nZ0NK2P1VvzQgpWgKQ6/u3Fg@public.gmane.org>
2007-05-29 20:45 ` Michael Buesch
[not found] ` <200705292245.22940.mb-fseUSCV1ubazQB+pC5nmwQ@public.gmane.org>
2007-05-29 21:01 ` Stephen Hemminger
2007-05-29 21:05 ` Gary Zambrano
[not found] ` <1180472741.17711.19.camel-opBMJL+S1+nCw/J+WP9nZ0NK2P1VvzQgpWgKQ6/u3Fg@public.gmane.org>
2007-05-29 22:39 ` Jeff Garzik
[not found] ` <465CABA3.10003-e+AXbWqSrlAAvxtiuMwx3w@public.gmane.org>
2007-05-29 21:36 ` Gary Zambrano
2007-05-30 10:45 ` Michael Buesch
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