Re: UDP regression with packets rates < 10k per sec
From: Eric Dumazet <hidden>
Date: 2009-09-10 20:37:57
Something must be wrong with program or whatever... On the receiver I did this to trace the latency messages only # tcpdump -i eth0 not host 239.0.192.2 and port 9002 -n 22:28:07.223300 IP 55.225.18.7.9002 > 55.225.18.5.9002: UDP, length 32 22:28:07.223403 IP 55.225.18.5.9002 > 55.225.18.7.9002: UDP, length 32 22:28:08.223301 IP 55.225.18.7.9002 > 55.225.18.5.9002: UDP, length 32 22:28:08.223416 IP 55.225.18.5.9002 > 55.225.18.7.9002: UDP, length 32 22:28:09.223380 IP 55.225.18.7.9002 > 55.225.18.5.9002: UDP, length 32 22:28:09.223494 IP 55.225.18.5.9002 > 55.225.18.7.9002: UDP, length 32 22:28:10.223481 IP 55.225.18.7.9002 > 55.225.18.5.9002: UDP, length 32 22:28:10.223597 IP 55.225.18.5.9002 > 55.225.18.7.9002: UDP, length 32 22:28:11.223581 IP 55.225.18.7.9002 > 55.225.18.5.9002: UDP, length 32 22:28:11.223678 IP 55.225.18.5.9002 > 55.225.18.7.9002: UDP, length 32 See how the answer is *very* slow ? Something like > 100 us ?