From: Jens Axboe <axboe@suse.de>
To: "Miller, Mike (OS Dev)" <mike.miller@hp.com>
Cc: akpm@osdl.org, linux-kernel@vger.kernel.org, linux-scsi@vger.kernel.org
Subject: Re: [PATCH 1/1] cciss per disk queue for 2.6
Date: Fri, 1 Jul 2005 20:21:12 +0200 [thread overview]
Message-ID: <20050701182111.GA24146@suse.de> (raw)
In-Reply-To: <D4CFB69C345C394284E4B78B876C1CF107DC0869@cceexc23.americas.cpqcorp.net>
On Fri, Jul 01 2005, Miller, Mike (OS Dev) wrote:
> Jens Axboe wrote:
> > Different thing, I'm talking about single volume starvation,
> > not volume-to-volume.
> >
> > > elevator algoritm(s) may be causing writes to starve reads
> > on the same
> > > logical volume. We continue to investigate our other
> > performance issues.
> >
> > I completely disagree. Even with an intelligent io scheduler,
> > starvation is seen on ciss that does not happen on other
> > queueing hardware such as 'normal' scsi controllers/drives.
> > So something else is going on, and the only 'fix' so far is
> > to limit the ciss queue depth heavily.
>
> We will investigate this further and come up with a solution. Could be
> the firmware, I suppose.
Unfortunately I don't have any hardware at hand for testing, so I cannot
do it myself. Would be appreciated!
--
Jens Axboe
next prev parent reply other threads:[~2005-07-01 18:19 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-07-01 16:53 [PATCH 1/1] cciss per disk queue for 2.6 Miller, Mike (OS Dev)
2005-07-01 16:53 ` Miller, Mike (OS Dev)
2005-07-01 18:21 ` Jens Axboe [this message]
-- strict thread matches above, loose matches on Subject: below --
2005-07-01 16:41 Miller, Mike (OS Dev)
2005-07-01 16:41 ` Miller, Mike (OS Dev)
2005-07-01 16:51 ` Jens Axboe
2005-06-30 21:03 mike.miller
2005-07-01 7:02 ` Jens Axboe
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