linux-kernel - RE: cfq performance gap

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Message-ID: <000001c71ed2$a90019b0$2e81030a@amr.corp.intel.com>
Date:	Wed, 13 Dec 2006 08:20:52 -0800
From:	"Chen, Kenneth W" <kenneth.w.chen@...el.com>
To:	"'Miquel van Smoorenburg'" <miquels@...tron.nl>,
	<linux-kernel@...r.kernel.org>
Subject: RE: cfq performance gap

Miquel van Smoorenburg wrote on Wednesday, December 13, 2006 1:57 AM
> Chen, Kenneth W <kenneth.w.chen@...el.com> wrote:
> >This rawio test plows through sequential I/O and modulo each small record
> >over number of threads.  So each thread appears to be non-contiguous within
> >its own process context, overall request hitting the device are sequential.
> >I can't see how any application does that kind of I/O pattern.
> 
> A NNTP server that has many incoming connections, handled by
> multiple threads, that stores the data in cylic buffers ?

Then whichever the thread that dumps the buffer content to the storage
will do one large contiguous I/O.
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