From: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
To: Pascal Chapperon <pascal.chapperon@wanadoo.fr>
Cc: Josh Boyer <jwboyer@redhat.com>,
linux-kernel@vger.kernel.org, kernel-team@fedoraproject.org
Subject: Re: RCU related performance regression in 3.3
Date: Fri, 4 May 2012 08:04:11 -0700 [thread overview]
Message-ID: <20120504150411.GC2411@linux.vnet.ibm.com> (raw)
In-Reply-To: <4FA3EAEE.9030601@wanadoo.fr>
On Fri, May 04, 2012 at 04:42:54PM +0200, Pascal Chapperon wrote:
> Le 01/05/2012 17:45, Paul E. McKenney a écrit :
>
> >Here is my RCU_FAST_NO_HZ patch stack on top of v3.4-rc4.
> >
> >Or you can pull branch fnh.2012.05.01a from:
> >
> > git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git
> >
> > Thanx, Paul
> >
> I applied your global patch on top of v3.4-rc4. But the slowdown is
> worse than before : boot sequence took 80s instead 20-30s (12s for
> initramfs instead of 2s).
>
> I'll send you rcu tracing log in a second mail.
Hmmm... Well, I guess I am glad that I finally did something that
had an effect, but I sure wish that the effect had been in the other
direction!
Just to make sure I understand: the difference between the 20-30s and
the 80s is exactly the patch I sent you?
Thanx, Paul
next prev parent reply other threads:[~2012-05-04 15:24 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-04-27 12:15 RCU related performance regression in 3.3 Pascal Chapperon
2012-04-28 3:42 ` Paul E. McKenney
2012-05-01 0:02 ` Paul E. McKenney
2012-05-01 8:55 ` Pascal Chapperon
2012-05-01 15:45 ` Paul E. McKenney
2012-05-04 14:42 ` Pascal Chapperon
2012-05-04 15:04 ` Paul E. McKenney [this message]
2012-05-04 21:41 ` Pascal Chapperon
2012-05-04 23:14 ` Paul E. McKenney
2012-05-10 8:40 ` Pascal Chapperon
2012-05-14 22:32 ` Paul E. McKenney
2012-05-18 11:01 ` Pascal Chapperon
2012-05-18 12:14 ` Paul E. McKenney
2012-05-18 14:48 ` Pascal Chapperon
-- strict thread matches above, loose matches on Subject: below --
2012-04-04 15:27 Josh Boyer
2012-04-04 21:36 ` Paul E. McKenney
2012-04-05 12:37 ` Josh Boyer
2012-04-05 14:00 ` Paul E. McKenney
2012-04-05 14:15 ` Pascal CHAPPERON
2012-04-05 14:39 ` Paul E. McKenney
2012-04-06 9:18 ` Pascal Chapperon
2012-04-10 16:07 ` Paul E. McKenney
2012-04-11 15:06 ` Pascal
2012-04-12 18:04 ` Paul E. McKenney
2012-04-16 21:02 ` Paul E. McKenney
2012-04-18 9:37 ` Pascal Chapperon
2012-04-18 14:01 ` Paul E. McKenney
2012-04-18 15:00 ` Pascal Chapperon
2012-04-18 15:23 ` Paul E. McKenney
2012-04-20 14:45 ` Pascal Chapperon
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