On Tue, Apr 19, 2005 at 08:56:03PM -0700, Jin Guojun [VFFS] wrote: > Bruce Evans wrote: > > >On Tue, 19 Apr 2005, Bosko Milekic wrote: > > > >> My experience with 6.0-CURRENT has been that I am able to push at > >> least about 400kpps INTO THE KERNEL from a gigE em card on its own > >> 64-bit PCI-X 133MHz bus (i.e., the bus is uncontested) and that's > > > > > >A 64-bit bus doesn't seem to be essential for reasonable performance. > > > >I get about 210 kpps (receive) for a bge card on an old Athlon system > >with a 32-bit PCI 33MHz bus. Overclocking this bus speeds up at least > >sending almost proportionally to the overclocking :-). This is with > >my version of an old version of -current, with no mpsafenet, no driver > >tuning, and no mistuning (no INVARIANTS, etc., no POLLING, no HZ > 100). > >Sending goes slightly slower (about 200 kppps). > > Yes, 64-bit is not essential for getting 400~700 Mbps as long as the system > has enough high memory bandwidth, but it is essential to get full Gigabits. > > Simple numbers are in "Tips" section at the bottom of the following page: > > http://www-didc.lbl.gov/NCS/generic/ncs-00.html > > and the details are described in the papers linked. > > P.S. Question the unit "kpps" used in original email. I am not sure > what this really means. > GigE is possible to produce 400 kpps if packet size is 300 > bytes or less. > If packet size is 1500 byte, the maximum pps is 83k (83kpps). > But, 200-400 kbps is kind low, maybe I missed some previous > emails.
Obviously we're talking about small packets. :-) -- Bosko Milekic [EMAIL PROTECTED] [EMAIL PROTECTED] _______________________________________________ freebsd-performance@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-performance To unsubscribe, send any mail to "[EMAIL PROTECTED]"
