2011/2/18 erik quanstrom <quans...@quanstro.net>: >> The high level overview is that it is stored in a shared page, mapped >> into each new process's memory space at start-up. The kernel is never >> entered; there are no context switches. The kernel has a timer that >> updates this page atomically. > > i wonder if that is uniformly faster. consider that > making reads of that page coherent enough on a > big multiprocessor and making sure there's not too > much interprocesser skew might be slower than a > system call.
Real world tests show that it is consistently faster. It's probably cached anyway. > - erik > >
