Date: Sun, 10 Aug 1997 00:14:29 -0700 From: "Michael L. VanLoon -- HeadCandy.com" <michaelv@MindBender.serv.net> To: Peter Mutsaers <plm@xs4all.nl> Cc: freebsd-current@freebsd.org Subject: Re: IDE vs SCSI was: flags 80ff works (like anybody doubted it) Message-ID: <199708100714.AAA04251@MindBender.serv.net> In-Reply-To: Your message of 09 Aug 97 00:54:13 %2B0200. <877mdw2smi.fsf@plm.xs4all.nl>
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>>> On Thu, 7 Aug 1997 23:27:18 -0500 (EST), "John S. Dyson"
>>> <toor@dyson.iquest.net> said:
> JSD> This is the result of my "slow" recent, but not the latest, greatest
> JSD> IDE drive (WD 4GB drive.):
> JSD> dd if=/dev/rwd1 of=/dev/null count=1600 bs=64k
> JSD> 104857600 bytes transferred in 10.881267 secs (9636525 bytes/sec)
>Hmm, my NCR815 does:
>~> dd if=/dev/rsd2 of=/dev/null count=1600 bs=64k
>104857600 bytes transferred in 15.215823 secs (6891352 bytes/sec)
>This is a seagate ST15150N.
>But for Wide and/or Ultra SCSI you can expect better values.
>
>More interesting is:
>
>~> dd if=/dev/rsd0 of=/dev/null count=1600 bs=64k&;dd if=/dev/rsd0 of=/dev/nul
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.
-----------------------------------------------------------------------------
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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