Date: Sun, 21 Mar 1999 17:49:45 -0500 (EST) From: Chuck Robey <chuckr@mat.net> To: Joerg Wunsch <joerg_wunsch@uriah.heep.sax.de> Cc: freebsd-scsi@FreeBSD.ORG, ken@plutotech.com Subject: Re: cvs commit: src/sys/cam cam_xpt.c Message-ID: <Pine.BSF.4.10.9903211744030.1893-100000@picnic.mat.net> In-Reply-To: <19990321110510.38582@uriah.heep.sax.de>
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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:
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.
----------------------------+-----------------------------------------------
Chuck Robey | Interests include any kind of voice or data
chuckr@glue.umd.edu | communications topic, C programming, and Unix.
213 Lakeside Drive Apt T-1 |
Greenbelt, MD 20770 | I run picnic (FreeBSD-current)
(301) 220-2114 | and jaunt (Solaris7).
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