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Mona writes about psana2: eventbuilder requires that all non-L1 have to be complete (i.e. all streams need to see SlowUpdate). This suggests to cpo that we need to eliminate the 0x80 bit and set xpm-pause_threshold low enough that we always guarantee at least one SlowUpdate can be received by all detectors. Matt agrees with this, but points out that the system must drain that SlowUpdate before another is sent down.
Brainstorming
Issue: SlowUpdate currently preempts L1Accept, so integrating detectors miss their normalization data
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