From: Ingo Molnar <mingo@elte.hu>
To: "S.Çağlar Onur" <caglar@pardus.org.tr>
Cc: LKML <linux-kernel@vger.kernel.org>,
Arjan van de Ven <arjan@linux.intel.com>
Subject: Re: Rescheduling interrupts
Date: Tue, 22 Jan 2008 17:05:57 +0100 [thread overview]
Message-ID: <20080122160557.GA31831@elte.hu> (raw)
In-Reply-To: <200801221755.56470.caglar@pardus.org.tr>
* S.Çağlar Onur <caglar@pardus.org.tr> wrote:
> > My theory is that for whatever reason we get "repeat" IPIs: multiple
> > reschedule IPIs although the other CPU only initiated one.
>
> Ok, please see http://cekirdek.pardus.org.tr/~caglar/dmesg.3rd :)
hm, the IPI sending and receiving is nicely paired up:
[ 625.795008] IPI (@smp_reschedule_interrupt) from task swapper:0 on CPU#1:
[ 625.795223] IPI (@native_smp_send_reschedule) from task amarokapp:2882 on CPU#1:
amarokapp does wake up threads every 20 microseconds - that could
explain it. It's probably Xorg running on one core, amarokapp on the
other core. That's already 100 reschedules/sec.
Ingo
next prev parent reply other threads:[~2008-01-22 16:06 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-01-21 23:19 Rescheduling interrupts S.Çağlar Onur
2008-01-22 10:57 ` Ingo Molnar
2008-01-22 12:55 ` S.Çağlar Onur
2008-01-22 15:23 ` Ingo Molnar
2008-01-22 15:37 ` Ingo Molnar
2008-01-22 16:00 ` S.Çağlar Onur
2008-01-22 15:55 ` S.Çağlar Onur
2008-01-22 16:05 ` Ingo Molnar [this message]
2008-01-22 16:11 ` S.Çağlar Onur
2008-01-22 16:22 ` S.Çağlar Onur
2008-01-22 17:03 ` Matt Mackall
2008-01-22 19:27 ` Ingo Molnar
[not found] ` <p73fxwoncs4.fsf@crumb.suse.de>
2008-01-23 15:52 ` Matt Mackall
2008-05-13 18:03 ` Vegard Nossum
2008-05-13 19:04 ` Vegard Nossum
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