linux-kernel - Re: [tip:core/rcu] Revert "rcu: Decrease memory-barrier usage based on semi-formal proof"

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Message-ID: <20110521131844.GE2271@linux.vnet.ibm.com>
Date:	Sat, 21 May 2011 06:18:44 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Yinghai Lu <yinghai@...nel.org>
Cc:	linux-kernel@...r.kernel.org, mingo@...hat.com, hpa@...or.com,
	tglx@...utronix.de, mingo@...e.hu
Subject: Re: [tip:core/rcu] Revert "rcu: Decrease memory-barrier usage
 based on semi-formal proof"

On Fri, May 20, 2011 at 05:02:40PM -0700, Yinghai Lu wrote:
> On 05/20/2011 04:49 PM, Paul E. McKenney wrote:
> > On Fri, May 20, 2011 at 04:16:28PM -0700, Yinghai Lu wrote:
> ...
> >>
> >> the same one i sent out before, but let DEBUG_LOCKING_API_SELFTESTS disabled.
> > 
> > OK, just to make sure I understand...  You are compiling exactly the
> > same kernel source tree with exactly the same .config, just with two
> > different versions of gcc, correct?
> yes.
> > 
> > If so, it is quite possible that the slow one is the correct one.  :-/
> yeah, new version always have problem.
> 
> looks like opensuse11.3 has 4.5.0 and fedora14 has 4.5.1

OK, so fedora14 is the fast one (4.5.1) and opensuse11.3 is the slow
one (4.5.0), correct?

							Thanx, Paul
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