From: Andy Warner <andyw@pobox.com>
To: Marc Bevand <bevand_m@epita.fr>
Cc: linux-ide@vger.kernel.org
Subject: Re: libata problems with 66Mhz Promise SATA150 TX4
Date: Tue, 14 Sep 2004 19:18:51 -0500 [thread overview]
Message-ID: <20040914191851.A7263@florence.linkmargin.com> (raw)
In-Reply-To: <41473287.7050101@epita.fr>; from bevand_m@epita.fr on Tue, Sep 14, 2004 at 08:03:51PM +0200
Marc Bevand wrote:
> [...]
> An easy way to reproduce the problem is to run 4 instances of 'dd' reading
> from 4 disks at the same time. It is much harder to reproduce when reading
> from 3 disks, and quasi-impossible to reproduce when reading from 2 disks.
I've tried, but cannot reproduce it here.
System is:
- Dual Xeon Dell Poweredge 2600
- Promise TX4 in 100MHz PCI-X slot.
- 4 x Seagate ST3160023AS
- 2.6.9-rc1
I've tried both dd and sg_utils, can't make it fail - no way, no how.
> [...]
> It seems the Promise chip has some problems under high-load conditions:
> the throughput I obtain when reading from 4 disks is 100 MB/s (at 33MHz)
> and 215 MB/s (at 66MHz)...
I'm observing a lower throughput than that, though ~60MB/s; so I'm
going to check to see if there is something else throttling
performance, below the point of failure.
--
andyw@pobox.com
Andy Warner Voice: (612) 801-8549 Fax: (208) 575-5634
next prev parent reply other threads:[~2004-09-15 0:20 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-09-13 21:14 libata problems with 66Mhz Promise SATA150 TX4 Paul Fisher
2004-09-14 18:03 ` Marc Bevand
2004-09-14 23:13 ` Jeff Garzik
2004-09-15 0:18 ` Andy Warner [this message]
2004-09-15 9:02 ` Marc Bevand
2004-09-15 13:08 ` Andy Warner
2004-09-15 13:45 ` Marc Bevand
2004-10-04 9:10 ` Generic bug/race in the IDE/SATA code ? Marc Bevand
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