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

To: linux-mips@linux-mips.org
Subject: Re: [RFC] synchronized CPU count registers on SMP machines
From: Keith Owens <kaos@sgi.com>
Date: Thu, 05 Jun 2003 10:18:28 +1000
In-reply-to: Your message of "Wed, 04 Jun 2003 15:39:30 MST." <20030604153930.H19122@mvista.com>
Original-recipient: rfc822;linux-mips@linux-mips.org
Sender: linux-mips-bounce@linux-mips.org
On Wed, 4 Jun 2003 15:39:30 -0700, 
Jun Sun <jsun@mvista.com> wrote:
>There are many benefits of having perfectly synchronized CPU
>count registers on SMP machines.
>
>I wonder if this is something which have been done before,
>and if this is feasible.

IA64 has to do this, arch/ia64/kernel/smpboot.c:ia64_sync_itc.  That
function is only called at boot time, but there have been discussions
about calling it regularly to resync the itc values, like NTP.  Of
course, it has no chance of working if you install cpus with different
itc frequencies.


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