linux-kernel - Re: Latest vfs scalability patch

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Message-ID: <20091006125125.GU5216@kernel.dk>
Date:	Tue, 6 Oct 2009 14:51:26 +0200
From:	Jens Axboe <jens.axboe@...cle.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Nick Piggin <npiggin@...e.de>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-fsdevel@...r.kernel.org,
	Ravikiran G Thirumalai <kiran@...lex86.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: Latest vfs scalability patch

On Tue, Oct 06 2009, Peter Zijlstra wrote:
> On Tue, 2009-10-06 at 12:26 +0200, Jens Axboe wrote:
> 
> > I did a quick perf analysis on that, but only on 8 clients (64 clients
> > basically causes perf to shit itself, it's just not functional).
> 
> Even when used with -a so that you profile each cpu? I can imagine the
> cacheline contention from the inherited counters to render a 64 thread
> machine less than usable?

No, that's without -a. I used -a for perf top, and that has some impact
on performance while it's running, but millions of miles apart from what
it does without it :-)

-- 
Jens Axboe

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