On Mon, 26 Jul 2004, Don Bowman wrote: > From: Luigi Rizzo [mailto:[EMAIL PROTECTED] > > On Mon, Jul 26, 2004 at 01:18:46PM -0700, Kelly Yancey wrote: > > ... > > > Out of curiousity, what sort of testing did you do to > > arrive at these > > > settings? I did some testing a while back with a SmartBits > > box pumping > > > packets through a FreeBSD 2.8Ghz box configured to route > > between two em > > > gigabit interfaces; I found that changing the burst_max and > > each_burst > > > parameters had almost no effect on throughput (maximum 1% > > difference). > > > > fast boxes are pci-bus limited, not CPU limited(*) so > > changing the burst > > size (which basically amortizes some CPU costs) has little if any > > effect. > > The PCI-X bus will probably be 64-bit 133MHz in this case, > the limit moves up to the P64H2 hub for large packets, > to the CPU for small packets. Polling becomes quite > critical to prevent livelock. >
Sorry, I should be been more clear. Polling certainly stopped livelock under extreme load, however I never found much difference whether the burst size was small or large. I was wondering if it was just the nature of my test and if in other environments the burst_max and each_burst knobs have a greater affect. Kelly -- Kelly Yancey - [EMAIL PROTECTED],FreeBSD.org} - [EMAIL PROTECTED] FreeBSD, The Power To Serve: http://www.freebsd.org/ _______________________________________________ [EMAIL PROTECTED] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-net To unsubscribe, send any mail to "[EMAIL PROTECTED]"
