From: Tim Wright <timw@splhi.com>
To: Paul Jakma <paulj@itg.ie>
Cc: Ian Stirling <root@mauve.demon.co.uk>, linux-kernel@vger.kernel.org
Subject: Re: Abysmal RAID 0 performance on 2.4.0-test10 for IDE?
Date: Thu, 28 Dec 2000 13:42:44 -0800 [thread overview]
Message-ID: <20001228134244.A1684@scutter.internal.splhi.com> (raw)
In-Reply-To: <200012261952.TAA11390@mauve.demon.co.uk> <Pine.LNX.4.30.0012271620530.24075-100000@rossi.itg.ie>
In-Reply-To: <Pine.LNX.4.30.0012271620530.24075-100000@rossi.itg.ie>; from paulj@itg.ie on Wed, Dec 27, 2000 at 04:23:43PM +0000
On Wed, Dec 27, 2000 at 04:23:43PM +0000, Paul Jakma wrote:
> On Tue, 26 Dec 2000, Ian Stirling wrote:
>
> > The PCI bus can move around 130MB/sec,
>
> in bursts yes, but sustained data bandwidth of PCI is a lot lower,
> maybe 30 to 50MB/s. And you won't get sustained RAID performance >
> sustained PCI performance.
>
No. A well-designed card and driver doing cache-line sized transfers can
achieve ~100MB/s. On the IBM (Sequent) NUMA machines, we achieved in excess
of 3GB/s sustained read I/O (database full table scan) on a 16-quad (32 PCI
bus) system. That works out at around 100MB/s per bus.
Regards,
Tim
--
Tim Wright - timw@splhi.com or timw@aracnet.com or twright@us.ibm.com
IBM Linux Technology Center, Beaverton, Oregon
"Nobody ever said I was charming, they said "Rimmer, you're a git!"" RD VI
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next prev parent reply other threads:[~2000-12-28 22:13 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20001226172448.A7660@convergence.de>
2000-12-26 16:35 ` Abysmal RAID 0 performance on 2.4.0-test10 for IDE? Rik van Riel
2000-12-26 19:52 ` Ian Stirling
2000-12-26 20:24 ` Barry K. Nathan
2000-12-27 16:23 ` Paul Jakma
2000-12-27 17:37 ` RAID - IDE - here we go again Jakob Østergaard
2000-12-28 21:42 ` Tim Wright [this message]
2000-12-28 21:57 ` Abysmal RAID 0 performance on 2.4.0-test10 for IDE? Mathieu Chouquet-Stringer
2000-12-25 23:29 Felix von Leitner
2000-12-25 23:48 ` Felix von Leitner
2000-12-26 13:58 ` Rik van Riel
2000-12-26 7:39 ` Andreas Dilger
2000-12-27 10:59 ` Ruth Ivimey-Cook
2000-12-27 18:10 ` safemode
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