linux-kernel - Re: RCU related performance regression in 3.3

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Message-ID: <20120504150411.GC2411@linux.vnet.ibm.com>
Date:	Fri, 4 May 2012 08:04:11 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Pascal Chapperon <pascal.chapperon@...adoo.fr>
Cc:	Josh Boyer <jwboyer@...hat.com>, linux-kernel@...r.kernel.org,
	kernel-team@...oraproject.org
Subject: Re: RCU related performance regression in 3.3

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

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