linux-kernel - Re: A quick fio test (was Re: [patch 00/13] Syslets, "Threadlets", generic AIO support, v3)

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Message-ID: <Pine.LNX.4.64.0702261338050.1881@alien.or.mcafeemobile.com>
Date:	Mon, 26 Feb 2007 13:40:29 -0800 (PST)
From:	Davide Libenzi <davidel@...ilserver.org>
To:	Jens Axboe <jens.axboe@...cle.com>
cc:	Suparna Bhattacharya <suparna@...ibm.com>,
	Ingo Molnar <mingo@...e.hu>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.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>,
	Ulrich Drepper <drepper@...hat.com>,
	Zach Brown <zach.brown@...cle.com>,
	Evgeniy Polyakov <johnpol@....mipt.ru>,
	"David S. Miller" <davem@...emloft.net>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: A quick fio test (was Re: [patch 00/13] Syslets, "Threadlets",
 generic AIO support, v3)

On Mon, 26 Feb 2007, Jens Axboe wrote:

> 
> Some more results, using a larger number of processes and io depths. A
> repeat of the tests from friday, with added depth 20000 for syslet and
> libaio:
> 
> Engine          Depth   Processes       Bw (MiB/sec)
> ----------------------------------------------------
> libaio            1         1            602
> syslet            1         1            759
> sync              1         1            776
> libaio           32         1            832
> syslet           32         1            898
> libaio        20000         1            581
> syslet        20000         1            609

That looks great! IMO there may be a little higher cost associated with 
the syslets thread switches, that we currently do not perform 100% 
cleanly, but results look nevertheless awesome.



- Davide


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