> On Nov 20, 2017, at 7:12 PM, Justin Hibbits <jhibb...@freebsd.org> wrote: > > Author: jhibbits > Date: Tue Nov 21 03:12:16 2017 > New Revision: 326045 > URL: https://svnweb.freebsd.org/changeset/base/326045 > > Log: > Check the page table before TLB1 in pmap_kextract() > > The vast majority of pmap_kextract() calls are looking for a physical memory > address, not a device address. By checking the page table first this saves > the formerly inevitable 64 (on e500mc and derivatives) iteration loop > through TLB1 in the most common cases. > > Benchmarking this on the P5020 (e5500 core) yields a 300% throughput > improvement on dtsec(4) (115Mbit/s -> 460Mbit/s) measured with iperf. > > Benchmarked on the P1022 (e500v2 core, 16 TLB1 entries) yields a 50% > throughput improvement on tsec(4) (~93Mbit/s -> 165Mbit/s) measured with > iperf.
Nice! -- Marcel Moolenaar mar...@xcllnt.net _______________________________________________ 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"
