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* [ltt-dev] Time in trace passes too slowly
@ 2011-04-12 22:05 Francis Giraldeau
  2011-04-13 15:38 ` Mathieu Desnoyers
       [not found] ` <BLU0-SMTP705696D47DFABC88D7F84596AA0@phx.gbl>
  0 siblings, 2 replies; 3+ messages in thread
From: Francis Giraldeau @ 2011-04-12 22:05 UTC (permalink / raw)


Hi, 

In a trace, the time difference between two timestamps doesn't match the
time it should have elapsed. For example, when measuring the duration of
"sleep 1" in the trace, 0.358s is obtained. The real duration of the
sleep is indeed 1 second. The error seems proportional to a constant
factor. 

I get this behavior on a 32 bits Ubuntu with 2.6.35-24-lttng from the
PPA. I'm running the same version of kernel but configured with 64 bits
and durations are correct. 

I put a sample trace here:

http://secretaire.dorsal.polymtl.ca/~fgiraldeau/sleep-1x-1sec.tar.gz

Seems a bug to me, or maybe I'm doing something wrong?

Cheer, 

Francis





^ permalink raw reply	[flat|nested] 3+ messages in thread

end of thread, other threads:[~2011-04-18 14:11 UTC | newest]

Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2011-04-12 22:05 [ltt-dev] Time in trace passes too slowly Francis Giraldeau
2011-04-13 15:38 ` Mathieu Desnoyers
     [not found] ` <BLU0-SMTP705696D47DFABC88D7F84596AA0@phx.gbl>
2011-04-18 14:11   ` Francis Giraldeau

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