Hi, I'm having some issues trying to correlate timings creating from lttng with another machine. In essence, I'm trying to perform an end to timing test which involves sending a UDP packet to the box (which is running lttng[2.8] to track various events), which then does some work on the payload and sends it back to the orignator. Prior to transmission and after reception I print out the start/end times retrieved from clock_gettime using CLOCK_REALTIME.
Both machines are sync'd up to NTP, I use "ntpq -p" to display the time offset between the two (I've also used "clockdiff" which confirms this same offset). Therefore, my thinking is that I should be able to apply this offset to the timestamps generated by lttng to have them referenced to the same clock. The issue I'm finding though is that the timestamps seems wildely out - in some instances even by a 2-3 seconds (when I'm showing an offset between the two machines of just a few milliseconds). So I'm a little puzzled by what I'm seeing here and how to proceed. Any help appreciated. Rgs, Jon. == mailto:j...@onasticksoftware.co.uk - in real life jon bird == http://www.onasticksoftware.co.uk - stuff, on-a-stick == "men love women, women love children, children love hamsters" == <technology out of control> _______________________________________________ lttng-dev mailing list lttng-dev@lists.lttng.org https://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev