On 04/10/2016 20:01, Konstantin Belousov wrote: > Author: kib > Date: Tue Oct 4 17:01:24 2016 > New Revision: 306680 > URL: https://svnweb.freebsd.org/changeset/base/306680 > > Log: > Re-apply r306516 (by cem): > > Reduce the cost of TLB invalidation on x86 by using per-CPU completion flags > > Reduce contention during TLB invalidation operations by using a per-CPU > completion flag, rather than a single atomically-updated variable.
Kostik, could this commit cause a problem reported in the below links? https://bz-attachments.freebsd.org/attachment.cgi?id=175614 https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=213371 > On a Westmere system (2 sockets x 4 cores x 1 threads), dtrace measurements > show that smp_tlb_shootdown is about 50% faster with this patch; > observations > with VTune show that the percentage of time spent in invlrng_single_page on > an > interrupt (actually doing invalidation, rather than synchronization) > increases > from 31% with the old mechanism to 71% with the new one. (Running a basic > file > server workload.) > > Submitted by: Anton Rang <rang at acm.org> > Reviewed by: cem (earlier version) > Sponsored by: Dell EMC Isilon > Differential Revision: https://reviews.freebsd.org/D8041 -- Andriy Gapon _______________________________________________ svn-src-all@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/svn-src-all To unsubscribe, send any mail to "svn-src-all-unsubscr...@freebsd.org"
