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

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Message-ID: <20070227152507.GA8294@elte.hu>
Date:	Tue, 27 Feb 2007 16:25:07 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Avi Kivity <avi@...o.co.il>
Cc:	suparna@...ibm.com, 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)


* Avi Kivity <avi@...o.co.il> wrote:

> But what about cpu usage?  At these low levels, the cpu is probably 
> underutilized.  It would be interesting to measure cpu time per I/O 
> request (or, alternatively, use an I/O subsystem that can saturate the 
> processors).

yeah - that's what testing on ramdisk (Jens') or on a loopback block 
device (mine) approximates to a certain degree.

	Ingo
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