Date: Sat, 25 Oct 1997 19:29:27 +0100 (MET) From: Wilko Bulte <wilko@yedi.iaf.nl> To: se@FreeBSD.ORG (Stefan Esser) Cc: dkelly@hiwaay.net, joe@via.net, freebsd-hackers@FreeBSD.ORG Subject: Re: 2.2.2-RELEASE '875 SCSI won't negotiage Message-ID: <199710251829.TAA00990@yedi.iaf.nl> In-Reply-To: <19971025111540.12105@mi.uni-koeln.de> from "Stefan Esser" at Oct 25, 97 11:15:40 am
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As Stefan Esser wrote...
> On 1997-10-20 20:24 -0500, dkelly@hiwaay.net wrote:
> This IS low!
>
> Seems your drive does not signal early command completion
> on writes, even if tags are used (or did you disable tags ?)
>
> What's the state of the WCE bit in mode page 8 ?
>
> # scsi -f /dev/sd0 -m 8
> WCE: 1
> [ ... having read further down, I see you DTRT WRT WCE ... ]
Side stepping but interesting all the same:
FreeBSD 2.2.1R / NCR810 / DEC RZ29B / Pentium 100 / WCE=1 / on /usr
-------Sequential Output-------- ---Sequential Input--
-Per Char- --Block--- -Rewrite-- -Per Char- --Block---
Machine MB K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU
%CPU
3980 97.6 5921 25.2 2063 14.1 4094 98.3 5813 20.4
ditto but WCE=0
Machine MB K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU /sec
%CPU
100 3957 97.4 5798 24.4 2057 14.0 4059 97.3 6773 23.7 102.9 5.6
Oh: DEC RZ29B == Seagate ST15150N Barracuda 4Gb.
Seems that WCE is a mixed blessing to say the least. All of this is an
ASUS P100 box
Wilko
_ ____________________________________________________________________
| / o / / _ Bulte email: wilko@yedi.iaf.nl http://www.tcja.nl/~wilko
|/|/ / / /( (_) Arnhem, The Netherlands - Do, or do not. There is no 'try'
------------------ Support your local daemons: run FreeBSD Unix -----Yoda
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