linux-kernel - Re: [patch 00/13] Syslets, "Threadlets", generic AIO support, v3

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Message-Id: <200703011531.12818.dada1@cosmosbay.com>
Date:	Thu, 1 Mar 2007 15:31:12 +0100
From:	Eric Dumazet <dada1@...mosbay.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Evgeniy Polyakov <johnpol@....mipt.ru>,
	Pavel Machek <pavel@....cz>, Theodore Tso <tytso@....edu>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ulrich Drepper <drepper@...hat.com>,
	linux-kernel@...r.kernel.org,
	Arjan van de Ven <arjan@...radead.org>,
	Christoph Hellwig <hch@...radead.org>,
	Andrew Morton <akpm@....com.au>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Zach Brown <zach.brown@...cle.com>,
	"David S. Miller" <davem@...emloft.net>,
	Suparna Bhattacharya <suparna@...ibm.com>,
	Davide Libenzi <davidel@...ilserver.org>,
	Jens Axboe <jens.axboe@...cle.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [patch 00/13] Syslets, "Threadlets", generic AIO support, v3

On Thursday 01 March 2007 15:16, Ingo Molnar wrote:
> * Eric Dumazet <dada1@...mosbay.com> wrote:
> > I can tell you that the problem (at least on my machine) comes from :
> >
> > gettimeofday(&tm, NULL);
> >
> > in evserver_epoll.c
>
> yeah, that's another difference - especially if it's something like an
> Athlon64 and gettimeofday falls back to pm-timer, that could explain the
> performance difference. That's why i repeatedly asked Evgeniy to use the
> /very same/ client function for both the epoll and the kevent test and
> redo the measurements. The numbers are still highly suspect - and we are
> already down from the prior claim of kevent being almost twice as fast
> to a 25% difference.

Also, ab is quite lame... Maybe we could use a epoll based 'stresser' 

On my machines (again ...), ab is the slow thing... not the 'server'

Some small differences in behavior could have a big impact on ab (and you 
could think there is a problem on the remote side)

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