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Date: Fri, 04 May 2012 16:42:54 +0200
From: Pascal Chapperon <pascal.chapperon@wanadoo.fr>
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To: paulmck@linux.vnet.ibm.com
CC: Josh Boyer <jwboyer@redhat.com>, linux-kernel@vger.kernel.org,
        kernel-team@fedoraproject.org
Subject: Re: RCU related performance regression in 3.3
References: <20177034.34764.1335528920975.JavaMail.www@wwinf1f04> <20120428034257.GA2495@linux.vnet.ibm.com> <20120501000245.GA4329@linux.vnet.ibm.com> <4F9FA50C.9070600@wanadoo.fr> <20120501154513.GD2441@linux.vnet.ibm.com>
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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.

Pascal