NFS server bottlenecks

[Rick Macklem]

I wrote:
> Oops, I didn't get the "readahead" option description
> quite right in the last post. The default read ahead
> is 1, which does result in "rsize * 2", since there is
> the read + 1 readahead.
> 
> "rsize * 16" would actually be for the option "readahead=15"
> and for "readahead=16" the calculation would be "rsize * 17".
> 
> However, the example was otherwise ok, I think? rick

I've attached the patch drc3.patch (it assumes drc2.patch has already been
applied) that replaces the single mutex with one for each hash list
for tcp. It also increases the size of NFSRVCACHE_HASHSIZE to 200.

These patches are also at:
  http://people.freebsd.org/~rmacklem/drc2.patch
  http://people.freebsd.org/~rmacklem/drc3.patch
in case the attachments don't get through.

rick
ps: I haven't tested drc3.patch a lot, but I think it's ok?

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