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From: Marcel Moolenaar <marcel@xcllnt.net>
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Subject: Re: svn commit: r326045 - head/sys/powerpc/booke
Date: Mon, 20 Nov 2017 22:22:50 -0800
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Cc: src-committers@freebsd.org, svn-src-all@freebsd.org,
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To: Justin Hibbits <jhibbits@FreeBSD.org>
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> On Nov 20, 2017, at 7:12 PM, Justin Hibbits <jhibbits@FreeBSD.org> =
wrote:
>=20
> Author: jhibbits
> Date: Tue Nov 21 03:12:16 2017
> New Revision: 326045
> URL: https://svnweb.freebsd.org/changeset/base/326045
>=20
> Log:
>  Check the page table before TLB1 in pmap_kextract()
>=20
>  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.
>=20
>  Benchmarking this on the P5020 (e5500 core) yields a 300% throughput
>  improvement on dtsec(4) (115Mbit/s -> 460Mbit/s) measured with iperf.
>=20
>  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!

--=20
Marcel Moolenaar
marcel@xcllnt.net