Timers and timing, was: MySQL Performance 6.0rc1

Poul-Henning Kamp phk at phk.freebsd.dk
Fri Oct 28 13:09:34 PDT 2005


In message <20051028200007.GP4115 at funkthat.com>, John-Mark Gurney writes:

>I was quite impressed by the speed up using the TSC over ACPI-fast...

The TSC is in essence a CPU register/counter which lives inside the
clock multiplier whereas the ACPI is an I/O port off somewhere in
PCI space on some bridge or other.

-- 
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk at FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.


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