increasing MAXNFSDCNT

[Rick Macklem]

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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