From: Jens Axboe <axboe@suse.de>
To: Daniel Phillips <phillips@arcor.de>
Cc: David Anderson <david-anderson2003@mail.com>,
linux-scsi@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: I/O Request [Elevator; Clustering; Scatter-Gather]
Date: Tue, 4 Mar 2003 15:20:41 +0100 [thread overview]
Message-ID: <20030304142041.GA660@suse.de> (raw)
In-Reply-To: <20030304141948.264C63BF9D@mx01.nexgo.de>
On Tue, Mar 04 2003, Daniel Phillips wrote:
> On Tuesday 04 March 2003 14:50, Jens Axboe wrote:
> > > Do Clustering of request and scatter-gather mean the same ?? Confused
> > > to the core... Kindly help me ...
> >
> > No, the elevator clustering refers to clustering request that are
> > contigious on disk. Scatter-gather may cluster sg entries that are
> > contigious in memory.
>
> Hi Jens,
>
> I think you meant to write *non*contiguous in memory (but contiguous on the
> device).
No I didn't. Well actually both may happen, depending on your hardware.
What I wrote covers basic x86 hardware.
--
Jens Axboe
next prev parent reply other threads:[~2003-03-04 14:20 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-03-04 13:32 I/O Request [Elevator; Clustering; Scatter-Gather] David Anderson
2003-03-04 13:50 ` Jens Axboe
2003-03-04 21:10 ` Daniel Phillips
2003-03-04 14:20 ` Jens Axboe [this message]
2003-03-04 17:47 ` Bryan Henderson
2003-03-04 18:04 ` Luben Tuikov
2003-03-04 14:14 ` Scott Merritt
-- strict thread matches above, loose matches on Subject: below --
2003-03-04 14:11 David Anderson
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