[issue1872] nfs stall (fix pushed)

["Thomas Nikolajsen \(via DragonFly issue tracker\)" <sinknull@xxxxxxxxxxxxxxxxxxxxx>]

Thomas Nikolajsen <thomas.nikolajsen@mail.dk> added the comment:

I reduced vfs.nfs.maxasyncbio to 16 (from default of 64),
and haven't seen the 'Insufficient sendspace' since.

NFS stall can still be experienced, if I do 'too many' things at once,
e.g. doing `git status' with repo and checkout on NFS mounts while
doing `make -j3 buildworld' did stall NFS.

Forced core dump avail. on request.

Using x86_64 system also still stall NFS (above was i386);
here forced core dump didn't work out, `panic' failed to generate core dump.

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<http://bugs.dragonflybsd.org/issue1872>
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