Date: Sun, 10 Aug 1997 01:07:42 -0700 From: "Michael L. VanLoon -- HeadCandy.com" <michaelv@MindBender.serv.net> To: dyson@freebsd.org Cc: plm@xs4all.nl, freebsd-current@freebsd.org Subject: Re: IDE vs SCSI was: flags 80ff works (like anybody doubted it) Message-ID: <199708100807.BAA04711@MindBender.serv.net> In-Reply-To: Your message of Sun, 10 Aug 97 02:58:47 -0500. <199708100758.CAA01850@dyson.iquest.net>
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>> l count=1600 bs=64k&
>> >i.e. start two of them at the same time.
>> >I get as result:
>> >104857600 bytes transferred in 41.430049 secs (2530955 bytes/sec)
>> >104857600 bytes transferred in 41.437855 secs (2530478 bytes/sec)
>> What would be much more interesting to me is if you would do this on a
>> four-drive ccd stripe-set, both with Ultra-Wide SCSI and "UltraIDE".
>> It would be interesting to have a process running non-stop, measuring
>> the amount of left-over CPU, at the same time.
>That *would* be interesting. Here are the results for running 2 and 3
>concurrent tests -- my GUESS it is likely that the drive is fairly slow
>because of the small (read ahead) cache on it -- this is on the same
>drive:
>
>1600+0 records in
>1600+0 records out
>104857600 bytes transferred in 68.005133 secs (1541907 bytes/sec)
>1600+0 records in
>1600+0 records out
>104857600 bytes transferred in 68.032161 secs (1541295 bytes/sec)
>
>1600+0 records in
>1600+0 records out
>104857600 bytes transferred in 90.446126 secs (1159338 bytes/sec)
>1600+0 records in
>1600+0 records out
>104857600 bytes transferred in 96.159300 secs (1090457 bytes/sec)
>1600+0 records in
>1600+0 records out
>104857600 bytes transferred in 96.263071 secs (1089282 bytes/sec)
Just for statistical fodder...
This is on NetBSD, basically 1.2.1, using an Adaptec 2940UW, with
tagged-command-queuing enabled. Four 1GB SCSI (not wide or ultra) drives,
two of which are "ancient" technology (Seagate ST31200Ns), and two
fairly decent (HP3323s), striped with a large ccd:
[root@MindBender]~# dd if=/dev/rccd0f of=/dev/null count=1600 bs=64k
1600+0 records in
1600+0 records out
104857600 bytes transferred in 13 secs (8065969 bytes/sec)
The machine is an Asus P55TP4N (Triton-1) motherboard, Cyrix 6x86
P166+ (the M1, not the M2), with 64MB EDO RAM.
Once again, this doesn't tell us how much CPU was left over during the
test, unfortunately...
-----------------------------------------------------------------------------
Michael L. VanLoon michaelv@MindBender.serv.net
--< Free your mind and your machine -- NetBSD free un*x >--
NetBSD working ports: 386+PC, Mac 68k, Amiga, Atari 68k, HP300, Sun3,
Sun4/4c/4m, DEC MIPS, DEC Alpha, PC532, VAX, MVME68k, arm32...
NetBSD ports in progress: PICA, others...
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