Date: Mon, 6 Jul 2015 16:29:56 -0500 From: Graham Allan <allan@physics.umn.edu> To: Rick Macklem <rmacklem@uoguelph.ca> Cc: freebsd-fs@freebsd.org Subject: Re: increasing MAXNFSDCNT Message-ID: <20150706212956.GO12772@physics.umn.edu> In-Reply-To: <1318238880.4985990.1436215575189.JavaMail.zimbra@uoguelph.ca> References: <20150706191956.GL12772@physics.umn.edu> <1318238880.4985990.1436215575189.JavaMail.zimbra@uoguelph.ca>
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On Mon, Jul 06, 2015 at 04:46:15PM -0400, Rick Macklem wrote: > 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. Would have helped if I stated the version too - I'm using 9.3 so it just supports "-n" (I can see "-minthreads" and "-maxthreads" in the 10.1 man pages). I guess I'm a bit cautious about increasing it though, since I expect it's possible I might rebuild a new patch release without remembering to re-edit nfsd.c. If that were the case and I'd specified "-n" > MAXNFSDCNT then this version of nfsd would revert back to DEFNFSDCNT = 4, which could be a painful shot in the foot. Thanks, Graham
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