Date: Sun, 14 Sep 1997 21:30:39 -0700 From: "Michael L. VanLoon -- HeadCandy.com" <michaelv@MindBender.serv.net> To: "John S. Dyson" <toor@dyson.iquest.net> Cc: tm@blom.co.id, current@freebsd.org Subject: Re: FYI: Interesting IDE-Ultra/33 results Message-ID: <199709150430.VAA04430@MindBender.serv.net> In-Reply-To: Your message of Sun, 14 Sep 97 22:49:07 -0500. <199709150349.WAA00530@dyson.iquest.net>
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[...]
>For those who might try to blow off the transfer rate issue,
>remember that slow transfers can add to the latency of a I/O
>transfer request. The faster the transfer rate from the drive, the
>shorter the channel will be busy, and the quicker the total
>response time can be. As I commented on earlier though, my
[...]
However, there's more than one way to minimize command overhead.
Which is why tagged-command-queuing is so important for SCSI
performance, allowing multiple commands to be queued with minimal
additional overhead.
I'm not minimizing the results above -- they are impressive. However,
I don't think that particular command overhead test completely
accounts for all the subtleties of this issue.
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Michael L. VanLoon michaelv@MindBender.serv.net
Contract software development for Windows NT, Windows 95 and Unix.
Windows NT and Unix server development in C++ and C.
--< 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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