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

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Message-ID: <20070228083805.GB9705@elte.hu>
Date:	Wed, 28 Feb 2007 09:38:05 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Jens Axboe <jens.axboe@...cle.com>
Cc:	Suparna Bhattacharya <suparna@...ibm.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)


* Jens Axboe <jens.axboe@...cle.com> wrote:

> Engine                Depth      Batch	Bw (KiB/sec)
> libaio		20000	   8		21,125
> syslet		20000	   8		19,610

i'd like to do something more about this to be more in line with libaio 
- if nothing else then for the bragging rights ;-) It seems to me that a 
drop of ~7% in throughput cannot be explained with any CPU overhead, it 
must be some sort of queueing + IO scheduling effect - right?

	Ingo
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