Steve Shorter wrote:

On Wed, May 19, 2004 at 04:55:20PM -0500, Eric Anderson wrote:

I have several heavily used NFS servers, currently running FreeBSD 4.9-RELEASE. I'm getting jammed up with all my nfsd processes being
busy, so clients see slow connections to the server. I have the nfsd
starting with a count of 20, which is the max set in the nfsd.c file.

Are there any risks I should be aware of before bumping up the max to
say 40, or even 50?

Depending on where the bottlnecks in the system are, you can crank this up to whatever works for you.

I have tested and am running nfs servers with 80
and 100 nfsd's with no problems at all

That's good to hear. Did you do any other tweaks? sysctl settings? mbufs?

What would it take to make this a sysctl adjustable value?

This isn't neccessary IM0, because the number of
nfd's can be set at runtime. But the default max in
nfsd.c should be increased.

I meant a sysctl for the MAXNFSDCNT setting in nfsd.c.

Should the max be bumped higher by default nowdays?


Thanks - any help/hints is appreciated.

You probably also want good nics (fxp0) and to
increase UDP buffer space. I have found that nfs over udp
offers supperior performance than tcp on a good LAN

I'm currently using 3com's (xl0,xl1) and Intel Gigabit cards (em0,em1). Most of my clients are using udp.

What did you set your buffer space to? Which sysctl did you change?


-- ------------------------------------------------------------------ Eric Anderson Sr. Systems Administrator Centaur Technology Today is the tomorrow you worried about yesterday. ------------------------------------------------------------------

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