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 22:43:48 +0530
From:	Suparna Bhattacharya <suparna@...ibm.com>
To:	Jens Axboe <jens.axboe@...cle.com>
Cc:	Ingo Molnar <mingo@...e.hu>, 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)

On Fri, Feb 23, 2007 at 05:25:08PM +0100, Jens Axboe wrote:
> On Fri, Feb 23 2007, Suparna Bhattacharya wrote:
> > On Fri, Feb 23, 2007 at 03:58:26PM +0100, Ingo Molnar wrote:
> > > 
> > > * 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).
> > 
> > I picked up the fio snapshot from 22nd Feb (fio-git-20070222212513.tar.gz)
> > and used the v3 syslet patches from your web-site.
> > 
> > Do I still need to get something more recent ?
> 
> Yes, you need to test the syslet+testing branch that Ingo referenced.
> Your test above is not totally fair right now, since you are doing
> significantly less system calls with libaio. So to compare apples with
> apples, try the syslet-testing branch. If you can't get it because of
> firewall problems, check http://brick.kernel.dk/snaps/ for the latest
> fio snapshot. If it has the syslet-testing branch, then that is
> recent enough.

I have a feeling this is getting to be a little more bleeding edge than
I had anticipated :), so will just hold off for a bit until this
crystallizes a bit.

Regards
Suparna

> 
> -- 
> Jens Axboe

-- 
Suparna Bhattacharya (suparna@...ibm.com)
Linux Technology Center
IBM Software Lab, India

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