Re: [PATCH RFC 0/7] x86: convert ticketlocks to C and remove duplicatecode

From: Jeremy Fitzhardinge
Date: Thu Jul 21 2011 - 19:38:05 EST

On 06/29/2011 01:44 PM, Andi Kleen wrote:
> Jeremy Fitzhardinge <jeremy@xxxxxxxx> 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.

Yes, I observed cases where they were faster. What is your lock
tester? Does it test the lock code in isolation, or in situ?

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