From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: dean gaudet <dean@arctic.org>
Cc: Jan Kasprzak <kas@fi.muni.cz>, linux-kernel@vger.kernel.org
Subject: Re: 3ware disk latency?
Date: Wed, 26 Jul 2006 21:37:29 +0100 [thread overview]
Message-ID: <1153946249.13509.29.camel@localhost.localdomain> (raw)
In-Reply-To: <Pine.LNX.4.64.0607260942110.22242@twinlark.arctic.org>
Ar Mer, 2006-07-26 am 09:52 -0700, ysgrifennodd dean gaudet:
> On Mon, 10 Jul 2006, Jan Kasprzak wrote:
>
> > Does anybody experience the similar latency problems with
> > 3ware 95xx controllers? Thanks,
>
> i think the 95xx is really bad at sharing its cache fairly amongst
> multiple devices... i have a 9550sx-8lp with 3 exported units: a raid1, a
> raid10 and a jbod. i was zeroing the jbod with dd and it absolutely
> destroyed the latency of the other two units.
Even on the older 3ware I found it neccessary to bump up the queue sizes
for the 3ware. There's a thread from about 6 months ago (maybe a bit
more) with Jeff Merkey included where it made a huge difference to his
performance playing with the parameters. Might be worth a scan through
the archive.
Alan
next prev parent reply other threads:[~2006-07-26 20:18 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-07-10 14:13 Jan Kasprzak
2006-07-26 16:52 ` dean gaudet
2006-07-26 20:37 ` Alan Cox [this message]
2006-07-26 21:53 ` dean gaudet
2006-07-26 22:07 ` adam radford
2006-07-26 22:10 ` Justin Piszcz
2006-07-26 22:48 ` Jeff V. Merkey
2006-07-26 22:20 ` adam radford
2006-07-27 3:00 ` dean gaudet
2006-07-27 13:42 ` Jan Kasprzak
2006-07-27 12:11 ` Jan Kasprzak
2006-07-27 18:30 ` David Lang
2006-08-02 11:48 Dieter Stüken
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