From: Ingo Molnar <mingo@elte.hu>
To: "Sébastien Dugué" <sebastien.dugue@bull.net>
Cc: linux-kernel@vger.kernel.org, Thomas Gleixner <tglx@linutronix.de>
Subject: Re: 2.6.17-rc6-rt3
Date: Mon, 12 Jun 2006 11:20:23 +0200 [thread overview]
Message-ID: <20060612092023.GA30872@elte.hu> (raw)
In-Reply-To: <1150104040.3835.3.camel@frecb000686>
* Sébastien Dugué <sebastien.dugue@bull.net> wrote:
> > I think all of the regressions reported against rt1 are fixed, please
> > re-report if any of them is still unfixed.
>
> Great, boots fine on my dual Xeon and solves the ping problem I was
> having.
>
> Thomas, any hint at what was going on?
the problem was caused by a mismerge of the __raise_softirq_irqoff()
changes of preempt-softirqs. In PREEMPT_SOFTIRQS, softirq activation
means a wakeup of the softirq thread - hence __raise_softirq_irqoff()
must wake up the softirq thead too. This didnt happen in -rt1 so the
network softirq (which processes things like ping reply packets) got
delayed to the natural softirq event - the next timer interrupt in the
usual case. Hence depending on HZ you got a delay of 1-4-10 msecs
(divided into two parts).
Ingo
next prev parent reply other threads:[~2006-06-12 9:21 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-06-10 8:24 2.6.17-rc6-rt3 Ingo Molnar
2006-06-10 10:32 ` 2.6.17-rc6-rt3 Michal Piotrowski
2006-06-10 12:44 ` 2.6.17-rc6-rt3 Thomas Gleixner
2006-06-10 13:30 ` 2.6.17-rc6-rt3 Michal Piotrowski
2006-06-10 14:43 ` 2.6.17-rc6-rt3 Michal Piotrowski
2006-06-10 12:32 ` 2.6.17-rc6-rt3 Mike Galbraith
2006-06-11 12:38 ` 2.6.17-rc6-rt3 Mike Galbraith
2006-06-11 17:22 ` 2.6.17-rc6-rt3 Thomas Gleixner
2006-06-11 19:26 ` 2.6.17-rc6-rt3 Mark Knecht
2006-06-12 9:20 ` 2.6.17-rc6-rt3 Sébastien Dugué
2006-06-12 9:20 ` Ingo Molnar [this message]
2006-06-12 9:35 ` 2.6.17-rc6-rt3 Sébastien Dugué
2006-06-12 9:21 ` 2.6.17-rc6-rt3 Thomas Gleixner
2006-06-12 17:08 ` 2.6.17-rc6-rt3 K.R. Foley
2006-06-12 17:19 ` 2.6.17-rc6-rt3 K.R. Foley
2006-06-12 17:22 ` 2.6.17-rc6-rt3 Thomas Gleixner
2006-06-12 17:32 ` 2.6.17-rc6-rt3 K.R. Foley
2006-06-16 18:51 ` 2.6.17-rc6-rt3 Bruce Eleniak
2006-06-16 19:04 ` 2.6.17-rc6-rt3 Bruce Eleniak
2006-06-16 19:24 ` 2.6.17-rc6-rt3 K.R. Foley
-- strict thread matches above, loose matches on Subject: below --
2006-06-10 13:44 2.6.17-rc6-rt3 henry kay
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