The first patch was, under a different title and with a different approach, already part of the prior series of the same subject. The other two patches are new, resulting from me spotting further room for improvement (or so I hope).
1: latch to-be-written TSC value early in rendezvous loop 2: yield to hyperthreads after updating TSC during rendezvous 3: avoid reading the platform timer in rendezvous functions Jan
