https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=254040
--- Comment #5 from Andriy Gapon <[email protected]> --- And a possible "eureka moment" that's consistent with the original description: if I choose odd logical CPUs, (cpuset -l $((2 * i + 1)), then I consistently get the worst results: $ ~/test.sh 4 1048576000 bytes transferred in 7.800822 secs (134418651 bytes/sec) 1048576000 bytes transferred in 7.803095 secs (134379498 bytes/sec) 1048576000 bytes transferred in 7.809778 secs (134264513 bytes/sec) 1048576000 bytes transferred in 7.810560 secs (134251064 bytes/sec) If this is indeed what it is, then several conclusions can be drawn: - hardware threads within a core are not born equal on this hardware - "primary" threads should be preferred - ULE does not do that -- You are receiving this mail because: You are the assignee for the bug.
