Date: Thu, 2 Mar 2017 07:50:03 +0100 From: Ben RUBSON <ben.rubson@gmail.com> To: svn-src-all@freebsd.org Subject: Re: svn commit: r313006 - in head: sys/conf sys/libkern sys/libkern/x86 sys/sys tests/sys/kern Message-ID: <988772E1-7521-4752-9DD7-E4DECA9AA558@gmail.com> In-Reply-To: <20170302162120.C8136@besplex.bde.org> References: <201701310326.v0V3QW30024375@repo.freebsd.org> <20170202184819.GP2092@kib.kiev.ua> <20170203062806.A2690@besplex.bde.org> <CAG6CVpV8fqMd82hjYoyDfO3f5P-x6%2B0OJDoQHtqXqY_tfWtZsA@mail.gmail.com> <20170228121335.Q2733@besplex.bde.org> <CAG6CVpWwZhMAsVB%2Bp-N0fMVOzzQSRaYonEfE-4Z6gv%2BLGuRn9w@mail.gmail.com> <20170302162120.C8136@besplex.bde.org>
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> On 02 Mar 2017, at 06:27, Bruce Evans <brde@optusnet.com.au> wrote: >=20 > On Wed, 1 Mar 2017, Conrad Meyer wrote: >=20 >> On my laptop (Intel(R) Core(TM) i5-3320M CPU =E2=80=94 Ivy Bridge) I = still see >> a little worse performance with this patch. Please excuse the ugly >> graphs, I don't have a better graphing tool set up at this time: >>=20 >> https://people.freebsd.org/~cem/crc32/sse42_bde.png >> https://people.freebsd.org/~cem/crc32/sse42_bde_log.png >=20 > Try doubling the loop sizes. There shouldn't be any significant = difference > above size 3*LONG unless LONG is too small. Apparently it is too = small for > older CPUs. Many thx Bruce & Conrad for your work on this ! My two cents, big chunks speed sounds (really) important as it will = impact data digest enabled iSCSI throughput. If needed, I could help with some benchmarks on my servers : Intel(R) Xeon(R) CPU E5-2620 v3 @ 2.40GHz Thank you !
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