Have you accounted for the transmission delay in your calculations?
i.e. as the sender wakes-up after 1ms, how much time does it take
for the data to travel to the other PC.
HTH,
-Sas
Sebastien GAUME wrote:
>
> Hi Wayne,
>
> > Do you mean here that the elapsed time as measured in the receiver is not one
>millisecond
> > and that the sum of the deviation from the expected 1 MS period accumulates to a
>positive
> > sum of errors when RTAI is the receiver and accumulates a negative sum of errors
>when rtl
> > is the receiver (respondent)? Or does the receiver initially have no error and
>after a
> > while start having a consistent error?
>
> I never do any sum of errors. Initially there's no error. In fact, before starting
>measuring,
> I do some kind of synchronization between the two PCs, to make them start at the
>same time.
> That's why the receiver's first wakeup is quite similar to the sender's first sending
> (difference about 5 us). But after a while, the difference between the sending time
>and the
> receiving time increases.
>
> Victor advised me to switch the two PCs, what I actually did. Unfortunately, the
>results
> remain the same. So what I have to do is to use CLOCK_GPOS.
>
> Sebastien
>
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