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Re: [RFC] synchronized CPU count registers on SMP machines

To: Ralf Baechle <ralf@linux-mips.org>
Subject: Re: [RFC] synchronized CPU count registers on SMP machines
From: Jun Sun <jsun@mvista.com>
Date: Wed, 4 Jun 2003 16:46:52 -0700
Cc: linux-mips@linux-mips.org, jsun@mvista.com
In-reply-to: <20030604231547.GA22410@linux-mips.org>; from ralf@linux-mips.org on Thu, Jun 05, 2003 at 01:15:47AM +0200
Original-recipient: rfc822;linux-mips@linux-mips.org
References: <20030604153930.H19122@mvista.com> <20030604231547.GA22410@linux-mips.org>
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On Thu, Jun 05, 2003 at 01:15:47AM +0200, Ralf Baechle wrote:
> On Wed, Jun 04, 2003 at 03:39:30PM -0700, Jun Sun wrote:
> 
> > 1) clocks on different CPUs don't have the same frequency
> > 2) clocks on different CPUs drift to each other
> > 2) some fancy power saving feature such as frequency scaling
> > 
> > But I think for a foreseeable future most MIPS SMP machines
> > don't have the above issues (true?).  And it is probably worthwile
> > to synchronize count registers for them.
> 
> 1) and 2) affect most SGI systems.
>

Assuming SGI systems represent the past of MIPS, we are still ok
future-wise. :)

Jun

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