svn commit: r313006 - in head: sys/conf sys/libkern sys/libkern/x86 sys/sys tests/sys/kern

[Ben RUBSON]

> On 02 Mar 2017, at 06:27, Bruce Evans <brde at optusnet.com.au> wrote:
> 
> On Wed, 1 Mar 2017, Conrad Meyer wrote:
> 
>> On my laptop (Intel(R) Core(TM) i5-3320M CPU — 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:
>> 
>> https://people.freebsd.org/~cem/crc32/sse42_bde.png
>> https://people.freebsd.org/~cem/crc32/sse42_bde_log.png
> 
> 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 !