Date: Wed, 12 Jan 2000 17:33:58 -0700 From: "Kenneth D. Merry" <ken@kdm.org> To: Joerg Micheel <joerg@cs.waikato.ac.nz> Cc: sthaug@nethelp.no, grios@ddsecurity.com.br, ohoyer@fbwi.fh-wilhelmshaven.de, freebsd-hardware@freebsd.org Subject: Re: hardware Message-ID: <20000112173358.A93414@panzer.kdm.org> In-Reply-To: <20000113132414.K5228@cs.waikato.ac.nz>; from joerg@cs.waikato.ac.nz on Thu, Jan 13, 2000 at 01:24:14PM %2B1300 References: <387D0354.63159B8@ddsecurity.com.br> <72218.947717759@verdi.nethelp.no> <20000113124314.I5228@cs.waikato.ac.nz> <20000112165428.A93083@panzer.kdm.org> <20000113132414.K5228@cs.waikato.ac.nz>
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On Thu, Jan 13, 2000 at 13:24:14 +1300, Joerg Micheel wrote: > 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) Those numbers are pretty close to what Seagate was claiming. > 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. What do you mean it causes bad reads? Are there any error message printed out? It may take careful tuning to get the same sorts of numbers out of rawio that you got out of dd, above, if that is even possible. (I haven't done much with rawio.) Ken -- Kenneth Merry ken@kdm.org To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hardware" in the body of the message
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