linux-kernel - Re: [Iscsitarget-devel] [Scst-devel] ISCSI-SCST performance (withalso IET and STGT data)

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Date:	Wed, 1 Apr 2009 08:29:19 +0200
From:	Bart Van Assche <bart.vanassche@...il.com>
To:	"Ross S. W. Walker" <RWalker@...allion.com>
Cc:	Vladislav Bolkhovitin <vst@...b.net>,
	iscsitarget-devel@...ts.sourceforge.net,
	scst-devel <scst-devel@...ts.sourceforge.net>,
	linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org,
	stgt@...r.kernel.org
Subject: Re: [Iscsitarget-devel] [Scst-devel] ISCSI-SCST performance (withalso 
	IET and STGT data)

On Tue, Mar 31, 2009 at 8:43 PM, Ross S. W. Walker
<RWalker@...allion.com> wrote:
> IET just needs to fix how it does it workload with CFQ which
> somehow SCST has overcome. Of course SCST tweaks the Linux kernel to
> gain some extra speed.

I'm not familiar with the implementation details of CFQ, but I know
that one of the changes between SCST 1.0.0 and SCST 1.0.1 is that the
default number of kernel threads of the scst_vdisk kernel module has
been increased to 5. Could this explain the performance difference
between SCST and IET for FILEIO and BLOCKIO ?

Bart.
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