Under FreeBSD 8.2 we have found that something goes haywire when TOS bits are set. When the TOS is 0 (default), we can get 9 Gbps performance with one of our test systems running perfSONAR (http://www.perfsonar.net). When we set the TOS bits to 32, the performance drops to about 4Mbps. This does not happen with FreeBSD 7.3.
We ran a tcptrace on the data and found very large numbers of retransmits and duplicate ACKs. I would attach the traces, but I know the mail list would remove them. Has anyone else seen this? Any idea what might be happening? -- R. Kevin Oberman, Network Engineer Energy Sciences Network (ESnet) Ernest O. Lawrence Berkeley National Laboratory (Berkeley Lab) E-mail: ober...@es.net Phone: +1 510 486-8634 Key fingerprint:059B 2DDF 031C 9BA3 14A4 EADA 927D EBB3 987B 3751 _______________________________________________ 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"
