From: Mike Galbraith <efault@gmx.de>
To: tglx@linutronix.de
Cc: "Sébastien Dugué" <sebastien.dugue@bull.net>,
"Ingo Molnar" <mingo@elte.hu>,
linux-kernel@vger.kernel.org, "John Stultz" <johnstul@us.ibm.com>,
"Deepak Saxena" <dsaxena@plexity.net>
Subject: Re: 2.6.17-rc6-rt1
Date: Fri, 09 Jun 2006 15:42:38 +0200 [thread overview]
Message-ID: <1149860558.7423.9.camel@Homer.TheSimpsons.net> (raw)
In-Reply-To: <1149858713.5257.146.camel@localhost.localdomain>
On Fri, 2006-06-09 at 15:11 +0200, Thomas Gleixner wrote:
> On Fri, 2006-06-09 at 14:57 +0200, Sébastien Dugué wrote:
> > All the round trips under strace are in the 2ms range.
> >
> > How on earth can it be that stracing the ping gives better
> > performance???
>
> Was busy fixing a scheduling while atomic bug. I just verified that I
> have the same weird behaviour. I'm looking into it.
I downloaded and patched a ping.c to do a user triggered latency trace
around recvfrom() of a ping -c 1 127.0.0.1 running SCHED_RR. We
schedule away at 25us, do aaaall kinds of interesting stuff, and come
back at 42234us. If you want the trace, holler. It's 51k bzipped.
-Mike
next prev parent reply other threads:[~2006-06-09 13:39 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-06-07 21:14 2.6.17-rc6-rt1 Ingo Molnar
2006-06-08 2:09 ` 2.6.17-rc6-rt1 Daniel Walker
2006-06-08 3:49 ` 2.6.17-rc6-rt1 Mark Knecht
2006-06-08 20:12 ` 2.6.17-rc6-rt1 Mark Knecht
2006-06-08 6:42 ` [PATCH -rt] Trivial compiler warning fix Jan Altenberg
2006-06-08 8:51 ` 2.6.17-rc6-rt1 Mike Galbraith
2006-06-08 19:52 ` 2.6.17-rc6-rt1 john stultz
2006-06-08 20:01 ` 2.6.17-rc6-rt1 Thomas Gleixner
2006-06-08 10:28 ` 2.6.17-rc6-rt1 Michal Piotrowski
2006-06-08 12:23 ` 2.6.17-rc6-rt1 Michal Piotrowski
2006-06-08 11:28 ` 2.6.17-rc6-rt1 Michal Piotrowski
2006-06-08 18:27 ` 2.6.17-rc6-rt1 Kevin Hilman
2006-06-08 19:03 ` 2.6.17-rc6-rt1 Thomas Gleixner
2006-06-08 23:57 ` 2.6.17-rc6-rt1 john stultz
2006-06-09 7:28 ` 2.6.17-rc6-rt1 Thomas Gleixner
2006-06-09 8:42 ` 2.6.17-rc6-rt1 Mike Galbraith
2006-06-09 10:12 ` 2.6.17-rc6-rt1 Sébastien Dugué
2006-06-09 11:35 ` 2.6.17-rc6-rt1 Mike Galbraith
2006-06-09 11:44 ` 2.6.17-rc6-rt1 Sébastien Dugué
2006-06-09 12:20 ` 2.6.17-rc6-rt1 Mike Galbraith
2006-06-09 12:57 ` 2.6.17-rc6-rt1 Sébastien Dugué
2006-06-09 13:11 ` 2.6.17-rc6-rt1 Thomas Gleixner
2006-06-09 13:42 ` Mike Galbraith [this message]
2006-06-09 14:31 ` 2.6.17-rc6-rt1 Thomas Gleixner
2006-06-09 15:55 ` 2.6.17-rc6-rt1 Daniel Walker
2006-06-09 18:41 ` 2.6.17-rc6-rt1 Mike Galbraith
2006-06-09 19:09 ` 2.6.17-rc6-rt1 Thomas Gleixner
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