svn commit: r326045 - head/sys/powerpc/booke
Marcel Moolenaar
marcel at xcllnt.net
Tue Nov 21 06:36:45 UTC 2017
> On Nov 20, 2017, at 7:12 PM, Justin Hibbits <jhibbits at 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
marcel at xcllnt.net
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