Date: Sun, 21 Mar 1999 19:15:16 -0700 (MST) From: "Kenneth D. Merry" <ken@plutotech.com> To: chuckr@mat.net (Chuck Robey) Cc: joerg_wunsch@uriah.heep.sax.de, freebsd-scsi@FreeBSD.ORG Subject: Re: cvs commit: src/sys/cam cam_xpt.c Message-ID: <199903220215.TAA63620@panzer.plutotech.com> In-Reply-To: <Pine.BSF.4.10.9903211744030.1893-100000@picnic.mat.net> from Chuck Robey at "Mar 21, 1999 5:49:45 pm"
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Chuck Robey wrote... > On Sun, 21 Mar 1999, J Wunsch wrote: > > > NCR 53C810 10 MHz 8 bit > > IBM DCAS-34330 S65A > > -------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 > > t=32,qm=0 100 3969 96.7 4435 39.1 1891 21.0 4079 94.5 5754 47.5 84.2 6.6 > > t=32,qm=1 100 3806 93.4 3167 27.4 1899 21.3 3911 91.1 5102 42.0 84.9 6.7 > > t=2,qam=0 100 3889 97.1 5500 45.4 2184 23.2 4125 95.8 5748 47.5 84.1 6.7 > > t=2,qam=1 100 3968 96.6 5408 46.8 2224 24.5 4209 97.6 5403 44.5 74.5 6.1 > > t=1,qam=0 100 3975 96.7 5446 43.8 1875 19.7 4175 97.2 5663 45.3 78.5 6.2 > > Huh. I tried using Ken's camcontrol patches, but when I did that (and > thus enabled tagged queueing) the drive hung within 10 seconds of > beginning bonnie. Now I'm somewhat surprised, because without queueing > turned on, here's what I get from bonnie: > > -------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 6229 80.9 6213 34.9 2250 13.5 5711 79.7 6390 25.6 85.2 4.6 > > This looks quite a bit better than yours, so I'm wondering if I'd doing > something to skew the results? I have a 5400 RPM DCAS 34330W: Joerg did say that he was doing his test a good ways down the disk (like 80%). That could easily explain the difference in performance. > da1 at ncr0 bus 0 target 1 lun 0 > da1: <IBM DCAS-34330W S65A> Fixed Direct Access SCSI-2 device > da1: Serial Number F3TX1813 > da1: 40.000MB/s transfers (20.000MHz, offset 15, 16bit) > da1: 4134MB (8467200 512 byte sectors: 255H 63S/T 527C) > > This was on a 100MB bonnie test. Caching can also explain things, depending on how much RAM you've got in your system. Ken -- Kenneth Merry ken@plutotech.com To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-scsi" in the body of the message
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