On Friday, June 03, 2011 2:03:55 am Andriy Gapon wrote: > > Consecutive RDTSCs used on a same CPU is always incremental but we > > cannot 100% guarantee that on two cores, even if TSC is derived from > > the same clock. I am hoping at least latency difference (I believe > > it's about few tens of cycles max) is "eaten up" by lowering > > resolution. It's not perfect but it's better than serialization > > (Linux) or heuristics (OpenSolaris), just because there are few rare > > conditions to consider. Thoughts? > > I am still not sure which case this code should solve. > > Thread T1: x1 = rdtsc() on CPU1; > Thread T1: x2 = rdtsc() on CPU2; > x2 < x1 ? > Or?
Yes, that can happen. -- John Baldwin _______________________________________________ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "freebsd-hackers-unsubscr...@freebsd.org"
