Re: [Iperf-users] UDP Delay Problem

2009-12-07 Thread Metod Kozelj
Howdy! Actually clock synchronization is quite tough job when one needs sub-millisecond acuracy. Here's output of one host: $ ntpq -pn remote refid st t when poll reach delay offset jitter =

Re: [Iperf-users] UDP Delay Problem

2009-12-04 Thread Aaron Brown
I'm not sure if you've looked into it, but there's another tool, OWAMP, that can be used to measure delay, jitter and packet loss unidirectionally ( http://www.internet2.edu/performance/owamp/ ). The thing with unidirectional packet measurement is that the hosts need to have their clocks we

Re: [Iperf-users] UDP Delay Problem

2009-12-04 Thread Metod Kozelj
Hi! I tried to replicate your tests ... using 3G HSPA+, iperf 2.0.4 on debian on internet side and jperf (iperf 2.0.2) on windows xp on dial-up side. I can see delay jitter reported by receiving side (in my case it's around 7.5ms in average in either direction when pushing 1.8Mbps of UDP),