NFS client READ performance on -current

[Garrett Wollman]

In article <201407151034.54681.jhb at freebsd.org>, jhb at freebsd.org writes:

>Hmm, I am surprised by the m_pullup() behavior that it doesn't just
>notice that the first mbuf with a cluster has the desired data already
>and returns without doing anything.

The specification of m_pullup() is that it returns a *writable* mbuf
(and thus also that the "length" provided is less than MHLEN).
Clusters are read-only.

-GAWollman