From: "Marc" <linux-raid@liquid-nexus.net>
To: linux-raid@vger.kernel.org
Subject: Re: Poor RAID5 performance on new SMP system
Date: Mon, 18 Oct 2004 12:56:19 +0800 [thread overview]
Message-ID: <20041018045338.M59852@liquid-nexus.net> (raw)
In-Reply-To: <41733C14.8020000@sauce.co.nz>
That thread is pretty old and I couldn't really find many references (on
google) about it. Perhaps its been fixed in later revisions of the AMD-768?
--
---------- Original Message -----------
From: Richard Scobie <richard@sauce.co.nz>
To: linux-raid@vger.kernel.org
Sent: Mon, 18 Oct 2004 16:44:20 +1300
Subject: Re: Poor RAID5 performance on new SMP system
> Marc wrote:
> > Hi,
> > I recently upgraded my file server to a dual AMD 2800+ on a Tyan Tiger
MPX
> > motherboard. The previous server was using a PIII 700 on an Intel 440BX
> > motherboard. I basically just took the IDE drives and their controllers
> > across to the new machine. The strange thing is that the RAID-5
performance
> > is worse than before! Have a look at the stats below:
>
> Hi Marc,
>
> Unfortunately you have a lemon :(
>
> I spent some time trying to get acceptable performance out of an
> Adaptec SCSI RAID 0 on the 32 bit, 33MHz bus of one of these boards
> and eventually found this:
>
> http://forums.2cpu.com/showthread.php?
s=c8040a4e9c9b6390dd389f1b3cca32de&threadid=31211&perpage=15
>
> The executive summary is
>
> "After testing AMD determined that the problem was identified as a
> bandwidth issue(this was startling information). It appears that the
> motherboard has a bandwidth limitation of 25MB/s on PCI devices that
> are connected through the AMD 768 Southbridge."
>
> This was in line with my findings.
>
> I have not tried, but it is possible that a 64 bit 66MHz IDE card
> will be OK.
>
> Regards,
>
> Richard
> -
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------- End of Original Message -------
next prev parent reply other threads:[~2004-10-18 4:56 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-10-18 2:11 Poor RAID5 performance on new SMP system Marc
2004-10-18 3:37 ` Guy
2004-10-18 4:04 ` Marc
2004-10-18 5:12 ` Guy
2004-10-18 3:44 ` Richard Scobie
2004-10-18 4:56 ` Marc [this message]
2004-10-18 17:26 ` Marc Marais
2004-10-18 18:41 ` Richard Scobie
2004-10-18 20:45 ` Guy
2004-10-20 3:24 ` Mark Hahn
2004-10-18 5:37 ` Gerd Knops
2004-10-18 6:12 ` Guy
2004-10-18 7:33 ` Marc
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