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Are these times the worst case, or the normal case? Has only the worstThese times are the normal case, and this normal case changed.
case changed?
What are other threads doing? Could maybe one of the other threads set off a DMA? DMA will compete for the memory bus with the fetch from ROM for the executable code, reads from the FIFO and writes to RAM. Hence everything will go slower if there is a DMA in action somewhere.
Having said this, your architecture does not sound very robust. Don't you have any hardware flow control? Carn't you tell the sender to pause while you catch up?
Andrew
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