linux-kernel - Re: A peek at the future of storage

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Date:	Wed, 12 Dec 2007 12:46:13 -0500
From:	"J. Bruce Fields" <bfields@...ldses.org>
To:	Daniel Phillips <phillips@...nq.net>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: A peek at the future of storage

On Wed, Dec 12, 2007 at 08:46:18AM -0800, Daniel Phillips wrote:
> Incidentally, we ran our tests with 128 knfsd threads.  The default of 8 
> threads produces miserable performance on the SSD, which gave us a good 
> scare on our initial test run.  It would be very nice to implement an 
> algorithm to scale the knfsd thread pool automatically, in order to 
> eliminate this class of thing that can go wrong.  If somebody became 
> inspired to take on that little project that would be great, otherwise 
> it is in our pipeline for, hmm, Christmas delivery.  (Exactly which 
> Christmas is left unspecified.)

People have proposed writing a daemon that just reads /proc/net/rpc/nfsd
periodically and uses that to adjust the number of threads from
userspace, probably subject to some limits in a config file someplace.
(Think that could do the job, or is there some reason this would be
easier in the kernel?)

--b.
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