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Date: Fri, 05 Jan 2007 15:11:07 -0800
From: Julian Elischer <julian@elischer.org>
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To: Luigi Rizzo <rizzo@icir.org>
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Cc: lulf@stud.ntnu.no, freebsd-current@freebsd.org,
	Paul Allen <nospam@nospam.com>, Ivan Voras <ivoras@fer.hr>,
	freebsd-geom@freebsd.org
Subject: Re: Pluggable Disk Schedulers in GEOM
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Luigi Rizzo wrote:
> On Fri, Jan 05, 2007 at 01:25:43PM -0800, Paul Allen wrote:
orant of I/O that
> 
> this was also on 4.11 which probably does not use softupdates.

yes it does.. Doesn't have UFS2 and snapshots however.


> 
> that does not mean that a scheduler is useless in general.
> in fact, what i find questionable is hardwiring unnecessary
> (in the sense that they are done only for performance reasons)
> ordering constraints in the layers above. I cannot comment for
> the disk, but e.g. for the process scheduler there are priority
> updates in many places depending on what the process is doing.
> 
> 	cheers
> 	luigi
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