linux-kernel - Re: [patch] x86: unify/rewrite SMP TSC sync code

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Date:	Sun, 26 Nov 2006 00:16:47 -0800
From:	Wink Saville <wink@...ille.com>
To:	Robert Hancock <hancockr@...w.ca>
CC:	linux-kernel <linux-kernel@...r.kernel.org>,
	Arjan van de Ven <arjan@...radead.org>
Subject: Re: [patch] x86: unify/rewrite SMP TSC sync code

Robert Hancock wrote:
>>>> Actually, we need to ask the CPU/System makers to provide a system wide
> Generally user mode code should just be using gettimeofday. When the TSC 
> is usable as a sane time source, the kernel will use it. When it's not, 
> it will use something else like the HPET, ACPI PM Timer or (at last 
> resort) the PIT, in increasing degrees of slowness.
> 

But gettimeofday is much too expensive compared to RDTSC.

Wink

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