Messages in this thread | | | From | Alex Elsayed <> | Subject | Re: [PATCH 00/12] Add kdbus implementation | Date | Thu, 30 Oct 2014 13:28:09 -0700 |
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Andy Lutomirski wrote:
<snip> > There should be a number measured in, say, nanoseconds in here > somewhere. The actual extent of the speedup is unmeasurable here. > Also, it's worth reading at least one of Linus' many rants about > zero-copy. It's not an automatic win.
It's well-understood that it's not an automatic win; significant testing on multiple architectures indicated that 512K is a surprisingly universal crossover point. The userspace code, therefore, switches from copying (normal kdbus parameters) to zero-copy (memfds) right around there.
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