linux-kernel - Re: [rfc][patch] store-free path walking

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Date:	Fri, 9 Oct 2009 10:54:52 +0200
From:	Jens Axboe <jens.axboe@...cle.com>
To:	Nick Piggin <npiggin@...e.de>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-fsdevel@...r.kernel.org,
	Ravikiran G Thirumalai <kiran@...lex86.org>,
	Peter Zijlstra <peterz@...radead.org>
Subject: Re: [rfc][patch] store-free path walking

On Thu, Oct 08 2009, Nick Piggin wrote:
> This is actualy nice too. My tests were on a 2s8c Barcelona system,
> but this is showing we have a nice serial win on Nehalem as well.
> Actually K8 CPUs have a bit faster lock primitives than earlier
> Intel CPUs I think (closer to Nehalem), so we might see an even
> bigger win with a Core2.

Ran it on another box. This isn't quite a core 2 though, it's a sparc64
(Niagara 2). It has 64 threads, too, but just 8 cores.

2.6.32-rc3 serial
real    0m5.390s
user    0m1.340s
sys     0m2.970s

2.6.32-rc3 parallel
real    0m2.009s
user    0m0.900s
sys     0m2.490s

vfs serial
real    0m4.816s
user    0m1.250s
sys     0m2.270s

vfs parallel
real    0m1.967s
user    0m0.920s
sys     0m1.960s

So it's a win-win there on that platform too.

-- 
Jens Axboe

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