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

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Date:	Fri, 23 Feb 2007 15:58:26 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Suparna Bhattacharya <suparna@...ibm.com>
Cc:	Jens Axboe <jens.axboe@...cle.com>, 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>,
	Davide Libenzi <davidel@...ilserver.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: A quick fio test (was Re: [patch 00/13] Syslets, "Threadlets", generic AIO support, v3)


* Suparna Bhattacharya <suparna@...ibm.com> wrote:

> As a really crude (and not very realistic) example of the potential 
> impact of large numbers of outstanding IOs, I tried some quick direct 
> IO comparisons using fio:
> 
> [global]
> ioengine=syslet-rw
> buffered=0
> rw=randread
> bs=64k
> size=1024m
> iodepth=64

could you please try those iodepth=20000 tests with the latest 
fio-testing branch of fio as well? Jens wrote a new, smarter syslet 
plugin for FIO. You'll need the v3 syslet kernel plus:

 git-clone git://git.kernel.dk/data/git/fio.git
 cd fio
 git-checkout syslet-testing

my expectation is that it should behave better with iodepth=20000 
(although i havent tried that yet).

	Ingo
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