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To: Kris Kennaway <kris@obsecurity.org>
From: "Poul-Henning Kamp" <phk@phk.freebsd.dk>
In-Reply-To: Your message of "Sun, 20 May 2007 18:37:27 -0400."
	<20070520223727.GB44666@xor.obsecurity.org> 
Date: Mon, 21 May 2007 14:55:21 +0000
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Cc: takawata@freeBSD.org, njl@freeBSD.org, current@freeBSD.org
Subject: Re: HPET vs other timers 
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In message <20070520223727.GB44666@xor.obsecurity.org>, Kris Kennaway writes:

>no LOCK_PROFILING	24559.36 (baseline)
>TSC			19627.16
>ACPI-fast		4633.02
>HPET			2917.85
>i8254			panic :( [1]
>
>i.e. HPET is actually slower than all the other (working ;)
>timecounters in this configuration.
>
>Can you provide some more justification of why HPET has the highest
>quality factor and is appropriate to be used as the preferred
>timecounter?

I can't rememember who raised the quality of it recently, CVS will
know.  I was sceptical, because I also have systems where HPET
is slow.

-- 
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.