Date: Thu, 13 Jan 2000 13:24:14 +1300 From: Joerg Micheel <joerg@cs.waikato.ac.nz> To: "Kenneth D. Merry" <ken@kdm.org> Cc: sthaug@nethelp.no, grios@ddsecurity.com.br, ohoyer@fbwi.fh-wilhelmshaven.de, freebsd-hardware@freebsd.org, joerg@cs.waikato.ac.nz Subject: Re: hardware Message-ID: <20000113132414.K5228@cs.waikato.ac.nz> In-Reply-To: <20000112165428.A93083@panzer.kdm.org>; from Kenneth D. Merry on Wed, Jan 12, 2000 at 04:54:28PM -0700 References: <387D0354.63159B8@ddsecurity.com.br> <72218.947717759@verdi.nethelp.no> <20000113124314.I5228@cs.waikato.ac.nz> <20000112165428.A93083@panzer.kdm.org>
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On Wed, Jan 12, 2000 at 04:54:28PM -0700, Kenneth D. Merry wrote:
> On Thu, Jan 13, 2000 at 12:43:14 +1300, Joerg Micheel wrote:
> > FWIW, this is a 3.3-RELEASE system:
> >
> > da0: <SEAGATE ST150176LW 0002> Fixed Direct Access SCSI-2 device
> > da0: 40.000MB/s transfers (20.000MHz, offset 8, 16bit), Tagged Queueing Enabled
> > da0: 47702MB (97693755 512 byte sectors: 255H 63S/T 6081C)
> >
> > 48 [negara] (root) benchmarks/rawio/work # rawio /dev/rda0c
> > Random read Sequential read Random write Sequential write
> > ID K/sec /sec K/sec /sec K/sec /sec K/sec /sec
> > anon 3556.7 220 5227.6 319
> >
> > I can't perform any write tests, this drive is in use.
>
>
> That seems very low. What happens with dd? e.g.:
>
> dd if=/dev/rda0c of=/dev/null bs=1m count=4096
>
> At least for sequential reads, I would expect something in the
> neighborhood of what Seagate claims, and their claim of 22.5MB/sec doesn't
> seem out of line for a new drive with high media density like that one.
Hmm, still learning how to apply the tools properly ...
50 [negara] (root) # dd if=/dev/rda0c of=/dev/null bs=1m count=4096
4096+0 records in
4096+0 records out
4294967296 bytes transferred in 178.795312 secs (24021700 bytes/sec)
54 [negara] (root) # dd if=/dev/rda0c of=/dev/null bs=1m count=4096 skip=2047
4096+0 records in
4096+0 records out
4294967296 bytes transferred in 179.872815 secs (23877801 bytes/sec)
dd refuses to skip more than 2GB, so I cannot continue here ... but:
60 [negara] (root) # rawio -c 128 /dev/rda0c
Random read Sequential read Random write Sequential write
ID K/sec /sec K/sec /sec K/sec /sec K/sec /sec
anon 6790.6 103 14491.1 221
61 [negara] (root) # rawio -c 144 /dev/rda0c
Random read Sequential read Random write Sequential write
ID K/sec /sec K/sec /sec K/sec /sec K/sec /sec
anon 6777.9 92 13295.9 180
62 [negara] (root) # rawio -c 192 /dev/rda0c
Random read Sequential read Random write Sequential write
ID K/sec /sec K/sec /sec K/sec /sec K/sec /sec
anon 7163.9 73 14467.4 147
rawio -c 256 causes bad reads on the disk.
Joerg
--
Joerg B. Micheel Email: <joerg@cs.waikato.ac.nz>
Waikato Applied Network Dynamics Phone: +64 7 8384794
The University of Waikato, CompScience Fax: +64 7 8384155
Private Bag 3105 Pager: +64 868 38222
Hamilton, New Zealand Plan: TINE and the DAG's
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