Garrett D'Amore wrote: > I agree with Dana's sentiments here. > > I'll add one thing, from my own experience: in my own experience the > pain and suffering of dealing with scatter/gather is not justified on > modern systems with ordinary sized ethernet frames. In fact, experience
You might want to amend this with "on slow networks." For 10GbE or faster, (and maybe even 1GbE on old, slow hardware) s/g is definitely worth it. Just this morning I doing some tests on a fairly recent 8-way AMD64 with uperf. Copying rather than mapping roughly doubles CPU utilization (20% -> 40%) as reported by vmstat for 8 threads sending on a 10GbE interface (bandwidth is 10GbE line rate regardless). Drew _______________________________________________ driver-discuss mailing list [email protected] http://mail.opensolaris.org/mailman/listinfo/driver-discuss
