From owner-freebsd-arch  Tue Feb  6  0: 4:13 2001
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To: Terry Lambert <tlambert@primenet.com>
Cc: dillon@earth.backplane.com (Matt Dillon),
	gibbs@scsiguy.com (Justin T. Gibbs),
	bright@wintelcom.net (Alfred Perlstein),
	rjesup@wgate.com (Randell Jesup), mjacob@feral.com (Matthew Jacob),
	msmith@FreeBSD.ORG (Mike Smith), des@ofug.org (Dag-Erling Smorgrav),
	dnelson@emsphone.com (Dan Nelson),
	tanimura@r.dl.itc.u-tokyo.ac.jp (Seigo Tanimura), arch@FreeBSD.ORG
Subject: Re: Bumping up {MAX,DFLT}*PHYS (was Re: Bumping up {MAX,DFL}*SIZ in i386) 
In-Reply-To: Your message of "Tue, 06 Feb 2001 06:57:48 GMT."
             <200102060657.XAA12458@usr08.primenet.com> 
Date: Tue, 06 Feb 2001 09:03:51 +0100
Message-ID: <31836.981446631@critter>
From: Poul-Henning Kamp <phk@critter.freebsd.dk>
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In message <200102060657.XAA12458@usr08.primenet.com>, Terry Lambert writes:
>>    I think the idea Poul originally articulated -- having simple information
>>    like recommended I/O size, recommended cluster size, and/or maximum I/O
>>    size, is the correct solution.  Getting fancy might buy us a percent
>>    or two... it isn't worth the effort.
>
>I thought Poul had discarded that idea as unworkable, after having
>tried to make it work; I got the impression that he still liked
>the idea, but that he didn't have a way to make it practical (Poul,
>please correct me if I am misinterpreting your last post).

No, that is perfectly possible and basically on requires the addition
of a preferred modulus to the current data in dev_t / struct disk.

Optimal individual clustering is unworkable.

--
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk@FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.


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