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To: linux-kernel@vger.kernel.org
From: "H. Peter Anvin" <hpa@zytor.com>
Subject: Re: Voyager subarchitecture for 2.5.46
Date: 6 Nov 2002 14:36:32 -0800
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Followup to:  <Pine.LNX.4.44.0211060729210.2393-100000@home.transmeta.com>
By author:    Linus Torvalds <torvalds@transmeta.com>
In newsgroup: linux.dev.kernel
> 
> I disagree.
> 
> We should use the TSC everywhere (if it exists, of course), and the fact
> that two CPU's don't run synchronized shouldn't matter.
> 

If it exists, and works :-/

> It's clearly stupid in the long run to depend on the TSC synchronization.
> We should consider different CPU's to be different clock-domains, and just
> synchronize them using the primitives we already have (hey, people can use
> ntp to synchronize over networks quite well, and that's without the kind
> of synchronization primitives that we have within the same box).

Synchronizing them is nice, since it makes RDTSC usable in user
space (without nodelocking.)  If it ain't doable, then it ain't.

	-hpa
-- 
<hpa@transmeta.com> at work, <hpa@zytor.com> in private!
"Unix gives you enough rope to shoot yourself in the foot."
http://www.zytor.com/~hpa/puzzle.txt	<amsp@zytor.com>
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