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Date: Fri, 3 Nov 2000 01:09:09 +0100
From: Ernst de Haan <ernst@jollem.com>
To: Rick Jansen <Rick@Tweakers.net>
Cc: freebsd-questions@freebsd.org, questions@freebsd.org
Subject: Re: 15000rpm SCSI3 Ultra160Wide LVD Harddisks gets just 4769 K/sec (bonnie)
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In-Reply-To: <005401c04387$82a3c230$7300a8c0@hephaistos>; from Rick@Tweakers.net on Tue, Oct 31, 2000 at 11:11:25PM +0100
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Heya Rick,

Perhaps `bonnie' is not very reliable when it comes to testing. I did some
testing myself a while ago, and I found out that my LVD U2W disk (with
the special [read: expensive] cable) was only a bit faster than my regular
UDMA-33 harddisk, with a slave connected on the same cable.

Ernst

Rick Jansen wrote:
> Hi there,
> 
> I have a hardware RAID-5 setup, using 3 Cheetahs 18.9Gb 15000rpm. When i run
> Bonnie, this is the output:
> 
> bash-2.04$ bonnie
> File './Bonnie.248', size: 104857600
> Writing with putc()...done
> Rewriting...done
> Writing intelligently...done
> Reading with getc()...done
> Reading intelligently...done
> Seeker 1...Seeker 2...Seeker 3...start 'em...done...done...done...
>               -------Sequential Output-------- ---Sequential
> Input-- --Random--
>               -Per Char- --Block--- -Rewrite-- -Per
> Char- --Block--- --Seeks---
> Machine  MB K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU  /sec
> %CPU
>                100  4769   13.4    4814     4.1    5767    5.7    24421
> 100.0  239718 96.4 31833.2 199.6
> bash-2.04$
> 
> This seems really bad to me, on a "normal" system i get measurements maybe 8
> higher then this. What could be causing this? No use of DMA? How can i see
> whether it's using DMA? And how do i enable it?
> The SCSI Caching Raid controller is an Adaptec 2100s. Also, the creation of
> the 35Gb Raid array took 4 hours to complete. The server is going to be a
> database server.
> Could somebody please tell me what's going on?
> 
> Rick Jansen
> **************
> Server Administrator [Linux - FreeBSD]
> www.tweakers.net - www.fokzine.net
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> 
> 
> 
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