On 5.2/i386, man sysctl says

     To adjust the number of kernel nfsio threads used to service asynchronous
     I/O requests on an NFS client machine:

           # sysctl vfs.nfs.iothreads=4

     The default is 4; 20 is the maximum.  See nfssvc(2) and nfsd(8) for
     further discussion.

Does it still apply?  The default now seems to be

           # sysctl vfs.nfs.iothreads
           vfs.nfs.iothreads=-1

which scales itself to 4 when I copy a file from a NFS server.
Should I be touching vfs.nfs.iothreads manually?
Setting it to 20 just panicked my 5.2/i386.

Also, neither nfssvc(2) nor nfsd(8) seems
to contain any "further discussion" of this.

        Jan

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