From: Jaime Velasco Juan <jsagarribay@gmail.com>
To: efault@gmx.de, a.p.zijlstra@hello.nl, tglx@linuxtronix.de,
linux-kernel@vger.kernel.org
Subject: Regression (bisected): Lots of wakeups when using battery
Date: Fri, 30 Jul 2010 22:45:23 +0100 [thread overview]
Message-ID: <20100730214523.GA5571@pogo> (raw)
Hi, testing 2.6.35-rc5 I noticed that when my laptop is on battery,
there are bursts of wakeups (they seem random, but usually happens once
each 5 sec. or so; they cause some audible noise). If the laptop is plugged
it behaves well. In single user mode, there are usually 2 wakeups/sec with
the system idle, but on battery an with the bug, it goes to more than 100 w/s.
Bisection points to:
commit 3310d4d38fbc514e7b18bd3b1eea8effdd63b5aa
Author: Peter Zijlstra <peterz@infradead.org>
Date: Thu Jun 17 18:02:37 2010 +0200
nohz: Fix nohz ratelimit
Chris Wedgwood reports that 39c0cbe (sched: Rate-limit nohz) causes a
serial console regression, unresponsiveness, and indeed it does. The
reason is that the nohz code is skipped even when the tick was already
stopped before the nohz_ratelimit(cpu) condition changed.
Move the nohz_ratelimit() check to the other conditions which prevent
long idle sleeps.
Reverting said commit seems to fix the issue.
Regards
next reply other threads:[~2010-07-30 21:45 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-07-30 21:45 Jaime Velasco Juan [this message]
2010-07-31 4:01 ` Regression (bisected): Lots of wakeups when using battery Mike Galbraith
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