On 9 March 2018 at 07:01, Slawa Olhovchenkov <s...@zxy.spb.ru> wrote: > On Thu, Mar 08, 2018 at 05:04:11PM -0500, Arshan Khanifar wrote: > >> Executive Summary: >> - The PTI feature increases the system call times by more than 100%. >> - As a macrobenchmark, buildworld was used. Wall clock and user time >> showed no statistically-significant changes, while system time >> increased by less than 5%. >> >> This email contains the results for benchmarking the performance of the >> PTI patch on FreeBSD 12-current. As a microbenchmark, timing of >> getppid(2) system call was used, and as a macrobenchmark, a number of >> buildworld tasks were timed. >> > > Can you also run pre-patched kernel?
It's not easy to do an apples-to-apples comparison as there were a few followup changes to the PTI work, interspersed with unrelated changes. That said, I think Arshan has some benchmarks obtained during the development of the PTI changes that may be illustrative. The best approach is probably to compare stable/11 at r329450 (last stable/11 revision before the merge) with r329462 with PTI and IBRS disabled. _______________________________________________ freebsd-current@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-current To unsubscribe, send any mail to "freebsd-current-unsubscr...@freebsd.org"
