Unexpected delay on Ethernet itf

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Hi, 

I'm trying to solve a problem of delay on a routing box that uses two
ethernet interfaces.
Ususally, everything is fine and the box forwards frames within 1 or 2
ms. But occasionnally the last frame of a burst is not sent until new
traffic enters the box, as if this frame had to be pushed at some stage.
I believe that Tx fifo waits for a threshold before starting, or sends
immediatly a frame if it is complete, rigth ?

Any ideas on the subject are welcome

Fabien
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