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Date: Wed, 18 Sep 2002 01:58:38 +0200
From: Andi Kleen <ak@suse.de>
To: "David S. Miller" <davem@redhat.com>
Cc: ak@suse.de, johnstul@us.ibm.com, jamesclv@us.ibm.com,
       alan@lxorguk.ukuu.org.uk, linux-kernel@vger.kernel.org,
       anton.wilson@camotion.com
Subject: Re: do_gettimeofday vs. rdtsc in the scheduler
Message-ID: <20020918015838.A6684@wotan.suse.de>
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On Tue, Sep 17, 2002 at 04:46:49PM -0700, David S. Miller wrote:
>    From: Andi Kleen <ak@suse.de>
>    Date: Wed, 18 Sep 2002 01:52:09 +0200
> 
>    On Tue, Sep 17, 2002 at 04:32:46PM -0700, David S. Miller wrote:
>    > I know full well it isn't currently :-)
>    
>    Sorry, it's wrong. The x86 architecture has several such registers
> 
> Not in the processor, and not architectually specified.
> 
> All of the things you list are in the scope of things outside
> the cpu.

The local APIC timer is specified in the Intel Manual volume 3 for example.
It's an optional feature (CPUID), but pretty much everyone has it.

-Andi



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