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Thanks for looking into this, Chris.  The only thing I’ve been able to come up with on a quick look is that the time is maybe going into setting up the memory region for the DRP to share the event with the MEBs.  I think this is mostly libfabric manipulating the MMU for this already allocated space (the pebble).  Is the event buffer size maybe particularly large compared to the other DRPs?  I’m guessing that since it’s an Andor, maybe 8 MB?  Not sure what ‘vls’ does to it.  If the trigger rate for this DRP isn’t high (10 Hz?), we could maybe speed this step up by lowering the number of DMA buffers so that fewer MMU entries are needed.

Deadtime Issues

Jumping L1Count

In general, this error message is a sign that the back pressure mechanism is not working correctly and buffers are being overwritten.  L0Delay being set incorrectly is one possible cause, but other firmware "high water mark" buffer parameters can be another.

Timing System kcu1500 (or "sim")

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upper-right: PGP0 (controls)

upper-left: PGP1 (daq)

Jumping L1Count

cpo saw this error showing up in rix fim1 (MR4K2) on 10/16/21:

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