From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: davidchow@shaolinmicro.com (David Chow)
Cc: linux-kernel@vger.kernel.org, deanna_bonds@adaptec.com
Subject: Re: complain about dpt_2o driver and CPU time
Date: Fri, 17 May 2002 13:42:55 +0100 (BST) [thread overview]
Message-ID: <E178h4R-0006NH-00@the-village.bc.nu> (raw)
In-Reply-To: <3CE49230.40607@shaolinmicro.com> from "David Chow" at May 17, 2002 01:16:32 PM
> feel that the card is very slow, the test with Bonnie shows 1810KB/sec
> with CPU load less than 2%. This shows the CPU time is idle, but the
> load average go up to around 13-14 . This means the dpt_i2o driver is
The load average includes I/O waiting. So that may well mean you have 14
different processes waiting for the card.
> even faster than this Ultra-160 SCSI i960 RAID with 32MB cache. If this
> is the case, I will just throw it away and use my onboard Ultra-160
> connector with software RAID which runs faster(at least). This is almost
> unusable for even small workgroup server.
The numbers seem extremely poor. There are plenty of abysmally slow
RAID controllers out there but I'd expect bettere than 1810K/second even
on things like old Megaraid cards.
Alan
prev parent reply other threads:[~2002-05-17 12:24 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-05-17 5:16 complain about dpt_2o driver and CPU time David Chow
2002-05-17 12:42 ` Alan Cox [this message]
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