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

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Message-ID: <4FA3EAEE.9030601@wanadoo.fr>
Date:	Fri, 04 May 2012 16:42:54 +0200
From:	Pascal Chapperon <pascal.chapperon@...adoo.fr>
To:	paulmck@...ux.vnet.ibm.com
CC:	Josh Boyer <jwboyer@...hat.com>, linux-kernel@...r.kernel.org,
	kernel-team@...oraproject.org
Subject: Re: RCU related performance regression in 3.3

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

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