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Date:      Fri, 15 May 1998 15:51:22 -0600
From:      "Justin T. Gibbs" <gibbs@plutotech.com>
To:        Studded <Studded@dal.net>
Cc:        "Justin T. Gibbs" <gibbs@plutotech.com>, freebsd-stable@FreeBSD.ORG
Subject:   Re: 980513 CAM snapshot available. 
Message-ID:  <199805152155.PAA26379@pluto.plutotech.com>
In-Reply-To: Your message of "Fri, 15 May 1998 11:05:30 PDT." <355C83EA.9D74BD47@dal.net> 

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>Justin T. Gibbs wrote:
>
>> The device statistics portion of the 2.2-stable snapshot has not been
>> thoroughly tested yet, so I would appreciate feedback on iostat/systat/
>> vmstat functionality under 2.2.
>
>	I am always eager to help test new stuff for -Stable, however I have
>some questions if you don't mind. 

Sure.

>1. How stable is the cam stuff?  IOW, given that I don't really have
>time in my life right now to re-install my stuff (yes, I have backups,
>just no time :) should I be doing this?

CAM has been running on wcarchive for some time now.  The HotMail folks are
currently doing their regression tests on CAM for deployment.  Satoshi has
been using it for a long time for his "art server" project at Cal.  Pluto
uses it for a video server...

>From what I can tell, it is more robust than the old code.

>2. What are some *specific* things that I can test before installing cam
>and after which will show performance improvements, reliability, etc?  

CAM really shines for non-sequential I/O performance.  For instance, if you
fire off an iozone on your /usr partition, and then start launching some
apps, they should launch significantly faster under CAM than the old code
assuming your drives support tagged queuing.

>3. I have an Adaptec 2940 UW, an IBM DCAS 34300 UW drive and a zip
>drive. I'm running a very recent -Stable. Does this sound like a good
>platform for the cam stuff?  

The patches should just drop in.

>Congrats on your achievements thus far,

Thanks!


>Doug

--
Justin



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