linux-kernel - Re: [PATCH RFC 0/7] x86: convert ticketlocks to C and remove duplicate code

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Message-ID: <m2pqlw1i70.fsf@firstfloor.org>
Date:	Wed, 29 Jun 2011 13:44:19 -0700
From:	Andi Kleen <andi@...stfloor.org>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...e.hu>,
	the arch/x86 maintainers <x86@...nel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Nick Piggin <npiggin@...nel.dk>,
	Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
Subject: Re: [PATCH RFC 0/7] x86: convert ticketlocks to C and remove duplicate code

Jeremy Fitzhardinge <jeremy@...p.org> writes:
>
> I couldn't measure a consistent performance difference between the two
> implemenations; there seemed to be +/- ~1% +/-, which is the level of
> variation I see from simply recompiling the kernel with slightly
> different code alignment.

I ran your new locks in my lock tester and I have a similar experience.
There's some variation, but it seems to be in the usual variance.
In some cases the C locks were actually faster.

-Andi

-- 
ak@...ux.intel.com -- Speaking for myself only
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