[etherlab-users] Jitter + Timed Out datagrams

[Florian Pose]

Hallo Christian,

On Fri, Feb 27, 2009 at 11:32:55AM +0100, Christian Gieseler wrote:
> The thing is that while looking for the source of the jitter i
> connected the master directly to the slaves and then i get all these
> messages about the timed out frames. Of course i still want to know
> what causes the jitter, but at the moment i would really like to know
> why i get loads of Messages about timed aut datagrams, even in when
> the master is in idle mode. Does someone have an advice for me?

ok, I guess the jitter you're talking about and the lost frames are two
different problems.

For the last one, please try to bisect the bus by plugging certain
slaves out to see, if the frames are 'swallowed' by a certain slave. I
experienced this some time ago. If this brings no difference, do you
have the possibility to try another Ethernet adapter (perhaps another
driver)?

How are you measuring the jitter? What is your timing source? Do you use
the kernel or the userspace application interface?

-- 
Best regards,
Florian Pose

http://etherlab.org