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Date:      Thu, 30 Mar 2023 20:58:52 +0000
From:      bugzilla-noreply@freebsd.org
To:        bugs@FreeBSD.org
Subject:   [Bug 270551] nfsd ignores vfs.nfsd.maxthreads at startup
Message-ID:  <bug-270551-227@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D270551

            Bug ID: 270551
           Summary: nfsd ignores vfs.nfsd.maxthreads at startup
           Product: Base System
           Version: 13.1-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: bugs@FreeBSD.org
          Reporter: asomers@FreeBSD.org

The vfs.nfsd.maxthreads sysctl should control the maximum number of threads
that the nfs server creates.  Indeed it does, for nfs servers that are alre=
ady
running.  But when nfsd starts up, it ignores this setting.  Instead, it
overwrites it based on the value of the --maxthreads argument or else it
somehow chooses a sensible default.

This behavior is unfortunate, since /etc/rc.d/sysctl runs before
/etc/rc.d/nfsd.  That means you can't use the sysctl to control nfsd's
behavior.

Should nfsd check the sysctl if maxthreads is unset, and use that value?

Steps to Reproduce
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
# echo vfs.nfsd.maxthreads=3D128 >> /etc/sysctl.conf
# service sysctl restart
# sysctl vfs.nfsd.maxthreads
vfs.nfsd.maxthreads: 128
# service nfsd start
# sysctl vfs.nfsd.maxthreads
vfs.nfsd.maxthreads: 64

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