On Tue, Jan 29, 2019 at 07:26:27PM +0100, Marko Zec wrote: > On Mon, 28 Jan 2019 16:14:53 +0000 > Mark Johnston <ma...@freebsd.org> wrote: > > > Author: markj > > Date: Mon Jan 28 16:14:53 2019 > > New Revision: 343527 > > URL: https://svnweb.freebsd.org/changeset/base/343527 > > > > Log: > > MFC r343274, r343275: > > Optimize RISC-V copyin(9)/copyout(9) routines. > > Was this subjected to any benchmarks? I'd bet that placing
I only did some ad-hoc testing under QEMU with a few copyout()-intensive programs (a few procstat(1) invocations). In general I saw a roughly 5% decrease in runtimes. I don't yet have any hardware to test on, and I don't believe Mitchell (the submitter of the patch) does either. > addi a2, a2, -XLEN_BYTES > > before > > sd a4, 0(a1) > > instead of being scheduled after (the same goes for the byte copy loop) > would make the loops run faster on most in-order RV cores out there... That makes sense. I doubt it would make a difference under QEMU though. _______________________________________________ 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"
