Quoting r. Roland Dreier <[EMAIL PROTECTED]>: > But of course not all x86 processors > support lfence/mfence which leads to some ugly issues of how to handle > this
lfence seems to be part of SSE2, and I don't think we really need sfence/mfence. We can just require SSE2 support: http://en.wikipedia.org/wiki/SSE2#CPUs_supporting_SSE2 > > -- runtime detection seems important but I don't know a good way > to do that. Well, at startup we can read /proc/cpuinfo and look for sse2 in the flags: line. Seems simple enough. > Probably the best thing would be just to do "lock; addl > $0,0(%%esp)" by default and add a special compile flag or something to > enable mfence. I hope we can do something without compile flags - most people don't know enough to turn them on, and distros commonly compile for least common denominator. -- MST _______________________________________________ openib-general mailing list openib-general@openib.org http://openib.org/mailman/listinfo/openib-general To unsubscribe, please visit http://openib.org/mailman/listinfo/openib-general
