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To: John-Mark Gurney <gurney_j@resnet.uoregon.edu>
From: "Poul-Henning Kamp" <phk@phk.freebsd.dk>
In-Reply-To: Your message of "Fri, 28 Oct 2005 13:00:07 PDT."
	<20051028200007.GP4115@funkthat.com> 
Date: Fri, 28 Oct 2005 22:09:31 +0200
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Cc: current@freebsd.org
Subject: Re: Timers and timing, was: MySQL Performance 6.0rc1 
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In message <20051028200007.GP4115@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@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.