[originally posted to [EMAIL PROTECTED] Hello all,
recently I've tried a few benchmarks around pipe throughput on Linux vs. FreeBSD. Everyone interesting can see my stuff at http://213.148.29.37/PipeBench, and initial post to Linux kernel developers mailing list at http://www.uwsg.iu.edu/hypermail/linux/kernel/0803.0/1837.html 1) It was noticed (http://www.uwsg.iu.edu/hypermail/linux/kernel/0803.0/1842.html) that the page flipping may be a reason of FreeBSD advantage. I've looked at kern/sys_pipe.c and found that defining PIPE_NODIRECT should disable it. Is that correct ? 2) When I've tried to run the kernel (7.0-STABLE) with PIPE_NODIRECT defined, I didn't see any slowdown (note 30% is promised in kern/sys_pipe.c comments) even for I/O buffer sizes >= PIPE_MINDIRECT. So, what should be done with a pipe to see a difference between PIPE_NODIRECT enabled and disabled ? Thanks, Dmitry _______________________________________________ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "[EMAIL PROTECTED]"
