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 19:35:40 +0100
From:	Jens Axboe <jens.axboe@...cle.com>
To:	Suparna Bhattacharya <suparna@...ibm.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, Suparna Bhattacharya wrote:
> 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.

Fair enough, I'll try your test with a huge number of pending requests
and see how it fares.

-- 
Jens Axboe

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