linux-kernel - RE: [Scst-devel] [Iscsitarget-devel] ISCSI-SCST performance (with also IET and STGT data)

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Message-ID: <E2BB8074E5500C42984D980D4BD78EF9029E3D15@MFG-NYC-EXCH2.mfg.prv>
Date:	Thu, 2 Apr 2009 10:14:45 -0400
From:	"Ross S. W. Walker" <RWalker@...allion.com>
To:	"Vladislav Bolkhovitin" <vst@...b.net>,
	"James Bottomley" <James.Bottomley@...senPartnership.com>
Cc:	<linux-scsi@...r.kernel.org>,
	"iSCSI Enterprise Target Developer List" 
	<iscsitarget-devel@...ts.sourceforge.net>,
	<linux-kernel@...r.kernel.org>,
	"Ross Walker" <rswwalker@...il.com>,
	"scst-devel" <scst-devel@...ts.sourceforge.net>,
	<stgt@...r.kernel.org>
Subject: RE: [Scst-devel] [Iscsitarget-devel] ISCSI-SCST	performance (with also IET and STGT data)

Ross S. W. Walker wrote:
> Vladislav Bolkhovitin wrote:
> > Vladislav Bolkhovitin, on 04/02/2009 11:38 AM wrote:
> > > James Bottomley, on 04/02/2009 12:23 AM wrote:
> > >> 
> > >> SCST explicitly fiddles with the io context to get this to happen.  It
> > >> has a hack to block to export alloc_io_context:
> > >>
> > >> http://marc.info/?t=122893564800003
> > > 
> > > Correct, although I wouldn't call it "fiddle", rather "grouping" ;)
> 
> Call it what you like,
> 
> Vladislav Bolkhovitin wrote:
> > Ross S. W. Walker, on 03/30/2009 10:33 PM wrote:
> > 
> > I would be interested in knowing how your code defeats CFQ's extremely
> > high latency? Does your code reach into the io scheduler too? If not,
> > some code hints would be great.
> 

The above quoting was wrong, for accuracy, it should have read:

Vladislav Bolkhovitin wrote:
> Ross S. W. Walker, on 03/30/2009 10:33 PM wrote:
> > 
> > I would be interested in knowing how your code defeats CFQ's extremely
> > high latency? Does your code reach into the io scheduler too? If not,
> > some code hints would be great.
> 
> Hmm, CFQ doesn't have any extra processing latency, especially 
> "extremely", hence there is nothing to defeat. If it had, how could it 
> been chosen as the default?

Just so there is no misunderstanding who said what here.

-Ross

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