https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=234733
--- Comment #3 from Conrad Meyer <c...@freebsd.org> --- I tried the following test: $ cpuset -l 0 time sha1 <~200MBfile> (burn one result for caching, then repeat 3 trials) I got average 0.24 real, 0.22 user. You might pick a slightly larger file for bigger and more obvious differences at different steppings. Then I set CPBDis: cpucontrol -m '0xc0010015|=0x02000000' /dev/cpuctl0 and repeated the tests; I got average 0.29 real, 0.26 user. I ran "cpucontrol -m '0xc0010015&=~0x02000000' /dev/cpuctl0" and got 0.24/0.22 again. I also tried sysctl dev.cpu.0.freq=3400 (on my system, dev.cpu.0.freq_levels: 3400/3825 2800/2765 2200/1952). cpucontrol -m '0xc0010015' did not show CPBDis. Also, SHA1 timings remained ~0.24/0.22. I tried dev.cpu.0.freq=2800, waited a few seconds, and restored dev.cpu.0.freq=3400. cpucontrol -m '0xc0010015' still did not show CPBDis. SHA1 timings seemed to show the expected boosted performance. My CPU is a Zen1 Threadripper 1950x; perhaps this behavior is different on Zen+ (Ryzen 2xxx), or there is some difference due to BIOSes. But you might be interested in running the same tests and seeing what you find. -- You are receiving this mail because: You are the assignee for the bug. _______________________________________________ freebsd-bugs@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-bugs To unsubscribe, send any mail to "freebsd-bugs-unsubscr...@freebsd.org"
