Thank you very much for your feedback! Carl-Daniel Hailfinger wrote: ========================= > How did you measure your latency values? (with bridge in between) linux:~ # ping -f -c 1000 192.168.0.1 PING 192.168.0.1 (192.168.0.1) 56(84) bytes of data. --- 192.168.0.1 ping statistics --- 1000 packets transmitted, 1000 received, 0% packet loss, time 963ms rtt min/avg/max/mdev = 0.642/0.914/2.487/0.277 ms, ipg/ewma 0.964/1.023 ms (same config without bridge in between) linux:~ # ping -f -c 1000 192.168.0.1 PING 192.168.0.1 (192.168.0.1) 56(84) bytes of data. --- 192.168.0.1 ping statistics --- 1000 packets transmitted, 1000 received, 0% packet loss, time 883ms rtt min/avg/max/mdev = 0.767/0.834/4.925/0.173 ms, ipg/ewma 0.884/0.814 ms ========================= Same here. Ping delivers me the same values. I also tried following ping -f -c 1000 192.168.0.1 -i 0.03 this produces pretty the same traffic like the one I have from my telephony systems. I did a sniffer-trace on that and could not see any deviations as big as 5ms. Therefore I assume the bridge will handle ICMP easier/faster than normal UDP-traffic. I also did another test with iperf (http://dast.nlanr.net/Projects/Iperf/) with similar values: iperf -c 192.168.0.1 -u -len 90 -t 7200 20k This produces UDP traffic with 90ms packets every 30ms. Now I have again the deviations in steps of 5ms. So, icmp might not be a good tool to measure jitter in this terms. I am pretty sure you will have the same with iperf or any other method to produce UDP-traffic. Carl-Daniel Hailfinger wrote: ========================= It is very possible that a bridge changes the timing distribtion (but the drastic effect you're seeing shouldn't happen). ========================= I fully agree ;-) thanks, Christian PS: What I am doing wrong? Each mail from me is not put correctly into the corresponding position within the thread of the mailing list. Have M$ Outlook here... _______________________________________________ LARTC mailing list LARTC@xxxxxxxxxxxxxxx http://mailman.ds9a.nl/cgi-bin/mailman/listinfo/lartc
