[netperf-talk] zero-copy sendfile for Solaris

[Andrew Gallatin]

On Solaris, you need to jump through some ugly flaming hoops to get a
zero-copy sendfile.  To get sendfile to be zero copy took looking at
the kernel source, and running some dtrace scripts to verify that
snf_segmap was being used rather than uiomove.

The easiest way I've found to enable zero-copy sendfile on Solaris is

1) compile with largefile options
2) use sendfilev() rather than sendfile, so
   that I can set SFV_NOWAIT
3) use a really big (16MB or larger) file

The attached patch does all this, plus it enables sendfile
to be used at all on Solaris by adding a check for the
sendfile library so configure does not think Solaris 
is missing a sendfile routine.


Drew

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