On Thu, May 24, 2012 at 4:43 PM, Bjoern A. Zeeb <bzeeb-li...@lists.zabbadoz.net> wrote: > On 24. May 2012, at 22:55 , Kevin Oberman wrote: > >> When we set the ToS bits for less than best effort (also called >> scavenger) on packets (ToS=32), performance on FreeBSD 8.2 is >> terrible. It was as good as best effort on FreeBSD 7.3 (assuming no >> congestion). I will look into what 9 does, but does anyone have an >> idea of why 8.2 behaves so badly when ToS is set to 32? >> Here is an example of what happens to performance: >> nuttcp with ToS=0: >> 622.5000 MB / 1.00 sec = 5221.7570 Mbps >> 623.3125 MB / 1.00 sec = 5228.5883 Mbps >> 624.0000 MB / 1.00 sec = 5234.4495 Mbps >> >> With ToS=32 (0x20): >> 0.3750 MB / 1.00 sec = 3.1457 Mbps >> 0.5000 MB / 1.00 sec = 4.1942 Mbps >> 0.5000 MB / 1.00 sec = 4.1942 Mbps >> >> This is,of course, on a 10G interface. On 7.3 there is little >> difference between the two. We are using cubic CC on the 8.2 system. > > This looks like a different problem than just TOS. I assume however > that not setting the TOS you get the same as expected performance? > > Which NIC?
The two nuttcp runs were identical and we got similar results with iperf. All tests were using Myricom (mxge) cards. -- R. Kevin Oberman, Network Engineer E-mail: kob6...@gmail.com _______________________________________________ freebsd-net@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-net To unsubscribe, send any mail to "freebsd-net-unsubscr...@freebsd.org"
