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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