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Re: [PATCH 00/26] ARM improvements


Richard Henderson <rth@twiddle.net> writes:

> Patches 19-23 add improved string routines for armv6t2.  I've had these
> hanging around for almost 2 years without properly submitting them. 
> Which is perhaps a bit silly, but the A8 host I was originally doing
> testing on has a dreadfully low resolution clock, so it was hard to get
> real numbers. Whereas the A15 has a 1ns resolution CLOCK_MONOTONIC_RAW.
> I can post the benchmarks under separate cover if you like.

With a suitable kernel hack, you can access the cycle counter from
userspace on any ARMv7 device.  This is probably more accurate and
avoids the syscall overhead.

-- 
Måns Rullgård
mans@mansr.com


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