From owner-freebsd-questions  Wed May 16 23:32:58 2001
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To: Peter Wemm <peter@wemm.org>
Cc: Nik Clayton <nik@FreeBSD.ORG>,
	Matt Dillon <dillon@earth.backplane.com>,
	Bruce Evans <bde@zeta.org.au>,
	Terry Lambert <tlambert2@mindspring.com>,
	dave <dleimbac@earthlink.net>, freebsd-questions@FreeBSD.ORG,
	arch@FreeBSD.ORG
Subject: Re: Gettimeofday Again... 
In-Reply-To: Your message of "Wed, 16 May 2001 19:55:48 PDT."
             <20010517025548.35895380E@overcee.netplex.com.au> 
Date: Thu, 17 May 2001 08:32:44 +0200
Message-ID: <9651.990081164@critter>
From: Poul-Henning Kamp <phk@critter.freebsd.dk>
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In message <20010517025548.35895380E@overcee.netplex.com.au>, Peter Wemm writes
:

>FYI: Pentium4 cpus have:
>Features=0x3febfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,
>  MCA,CMOV,PAT,PSE36,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,<b28>,ACC>
>
>The last one is interesting. As I understand it, ACC ("Auto Clock
>Correction") allows for TSC correction in spite of varying cpu clocks.
>
>This is important because of the variable cpu speed throttling to keep the
>heat down.

Hmm, anyone has any doc on that ?

-- 
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.

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