From owner-freebsd-scsi Wed Jul 14 0:18: 2 1999
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Date: Wed, 14 Jul 1999 16:39:04 +0930
From: Greg Lehey <grog@lemis.com>
To: Mikhail Teterin <mi@kot.ne.mediaone.net>, questions@FreeBSD.ORG,
scsi@FreeBSD.ORG
Subject: Re: SEAGATE ST34371W on an NCR -- slow :(
References: <199907140318.XAA25283@kot.ne.mediaone.net>
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In-Reply-To: <199907140318.XAA25283@kot.ne.mediaone.net>; from Mikhail Teterin on Tue, Jul 13, 1999 at 11:18:35PM -0400
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On Tuesday, 13 July 1999 at 23:18:35 -0400, Mikhail Teterin wrote:
> I'm getting a dissapointingly low performance from the only disk on the
> ncr0:
>
> ncr0: <ncr 53c875 fast20 wide scsi> rev 0x37 int a irq 21 on pci0.13.0
> ncr1: <ncr 53c875 fast20 wide scsi> rev 0x37 int b irq 22 on pci0.13.1
> [...]
> da0 at ncr0 bus 0 target 3 lun 0
> da0: <SEAGATE ST34371W 0440> Fixed Direct Access SCSI-2 device
> da0: 40.000MB/s transfers (20.000MHz, offset 15, 16bit), Tagged Queueing Enabled
> da0: 52MB (8496884 512 byte sectors: 255H 63S/T 528C)
>
> This is a dual PII-300MHz system with 64Mb of RAM running FreeBSD
> 3.2-STABLE from Wed Jul 7.
>
> The iozone's numbers are:
>
> File size set to 80000 KB
> Time Resolution = 0.000015 seconds.
> Processor cache size set to 1024 Kbytes.
> Processor cache line size set to 32 bytes.
> File stride size set to 17 * record size.
>
> random random
> KB reclen write rewrite read reread read write
> 80000 4 3885 1460 4842 4474 415 208
>
> bkwd record stride
> read rewrite read fwrite frewrite fread freread
> 988 135635 543 5235 1533 4674 4803
>
> Big things, like Netscape and KDE take very long to start up, probably
> even longer then they used to take on my older P90 system with the same
> amount of RAM.
>
> What should I be tuning? Thanks!
I'd be interested to see what results rawio shows. It bypasses the
buffer cache and measures raw disk performance. Take a look at
ftp://ftp.lemis.com/pub/rawio.tar.gz.
Greg
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