Date: Tue, 19 Oct 2010 10:18:24 +0200 From: Luigi Rizzo <rizzo@iet.unipi.it> To: David Naylor <naylor.b.david@gmail.com> Cc: freebsd-current@freebsd.org Subject: Re: geom_sched usage Message-ID: <20101019081824.GB54147@onelab2.iet.unipi.it> In-Reply-To: <201010190807.59491.naylor.b.david@gmail.com> References: <201010180943.37042.naylor.b.david@gmail.com> <20101018195125.GA46115@onelab2.iet.unipi.it> <201010190807.59491.naylor.b.david@gmail.com>
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On Tue, Oct 19, 2010 at 08:07:54AM +0200, David Naylor wrote: > On Monday 18 October 2010 21:51:25 Luigi Rizzo wrote: ... > > > - is there anyway to automatically attach gsched to a device on startup > > > (i.e. > > > > > > in rc.conf)? > > > > no, you have to build some script yourself. > > Would there be any interest in having a rc.d/ script? I would find it > conveniant to specify a single rc.conf line and get scheduling for all my > devices. PC-BSD might find such functionality useful. > > See attached for my first draft at such a script, I'm willing to hash it into > shape. it would surely be useful but try to keep it simple and user-driven (this is a general comment on rc.d scripts). Some things i think you should simplify in your script: - remove support for guessing which devices should get the scheduler. This is really a user decision and if the user names no devices then i believe it is better/safer not to install any scheduler. - use standard names such as gsched_flags or gsched_flags_${dev} to hold generic and specific flags for the insert command. It is neither useful nor flexible to have the script insert '-a' in front of the algorithm; cheers luigi
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