Date: Sun, 14 Sep 1997 19:04:37 +0000 From: Josh Tiefenbach <josh@doun.org> To: Stefan Esser <se@freebsd.org> Cc: hackers@freebsd.org, josh@doun.org Subject: Re: Problems with NCR810/Micropolis disk. Message-ID: <19970914190437.02165@doun.org> In-Reply-To: <19970914233827.50442@mi.uni-koeln.de>; from Stefan Esser on Sun, Sep 14, 1997 at 11:38:27PM %2B0200 References: <19970913204749.41765@doun.org> <19970914233827.50442@mi.uni-koeln.de>
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> > In searching the archives, the I found a post to -scsi circa 12/96 with the
> > exact same dmesg output (M_DISCONNEXT) involving an ncr810 and a 9GB
> > Micropolis drive, but no solution/explanation was offered.
>
> Really ? I don't remember having seen such a message ...
> Will have to check the archives myself ...
Search on -scsi for Joe Greco's post on Dec 10/96
>
> > Could this concievably be a hardware problem (ie, should I return the drive),
> > or is there something patently obvious that I'm missing?
>
> Well, I don't know how you measured those 250KB/s
> numbers. Could you please run bonnie (from ports) or
Bonnie results:
-------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 4046 49.4 4104 10.1 1675 6.8 4374 57.2 4661 13.4 87.5 2.8
> send results of "dd" with block sizes of 512 byte,
> 4KB and 16KB ?
dd results (in all cases, if=/dev/rsd0a of=/dev/null count = 10000)
asherah:~# dd if=/dev/rsd0a of=/dev/null bs=512 count=10000
10000+0 records in
10000+0 records out
5120000 bytes transferred in 19.132326 secs (267610 bytes/sec)
asherah:~# dd if=/dev/rsd0a of=/dev/null bs=4k count=10000
8192+0 records in
8192+0 records out
33554432 bytes transferred in 18.025235 secs (1861525 bytes/sec)
asherah:~# dd if=/dev/rsd0a of=/dev/null bs=16k count=10000
2048+0 records in
2048+0 records out
33554432 bytes transferred in 6.669969 secs (5030673 bytes/sec)
Hmmm. I see that with 16k blocksizes, the performance is much better, but the
drive still feels `pokey'.
--
HARANGUE, n.
A speech by an opponent, who is known as an harrangue-outang
-- Ambrose Bierce
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