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Date:      Mon, 6 Jul 2015 16:46:15 -0400 (EDT)
From:      Rick Macklem <rmacklem@uoguelph.ca>
To:        Graham Allan <allan@physics.umn.edu>
Cc:        freebsd-fs@freebsd.org
Subject:   Re: increasing MAXNFSDCNT
Message-ID:  <1318238880.4985990.1436215575189.JavaMail.zimbra@uoguelph.ca>
In-Reply-To: <20150706191956.GL12772@physics.umn.edu>
References:  <20150706191956.GL12772@physics.umn.edu>

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Graham Allan wrote:
> Regarding the maximum number of nfs server threads, is increasing the
> "#define MAXNFSDCNT 256" in nfsd.c the only thing needed to try higher
> values?
> 
Oops, my turn to admit that I should have read the man page before answering.
If you have a fairly recent nfsd that supports the "-maxthreads" option, you
can set this and I'm pretty sure you can make it larger than 256.
The system actually dynamically adjusts the # of nfsd kernel threads between
"-minthreads" and "-maxthreads". The "-n" option (which should probably be deprecated)
sets both of these to the same value and is limited to MAXNFSDCNT (256).

If your nfsd doesn't support "-maxthreads", increasing MAXNFSDCNT should work.

rick

> My FreeBSD nfs servers are still just at 128 threads, but I was
> experimenting with one of our linux servers which became happy
> at 512 threads (really ~400 in use under load). The load profile is
> pretty similar, so it might be reasonable to expect ending up around the
> same value.
> 
> Graham
> --
> 
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