Date: Tue, 11 Nov 2003 10:00:42 +1100
From: Anton Blanchard <anton@samba.org>
To: Jack Steiner <steiner@sgi.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: hot cache line due to note_interrupt()
Message-ID: <20031110230042.GF930@krispykreme>
References: <20031110215844.GC21632@sgi.com>
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Hi,

> I also verified on a system simulator that the counter in
> note_interrupt() is the only line that is bounced between cpus at a HZ
> rate on an idle system.
> 
> The IPI & reschedule interrupts have a similar problem but at a lower
> rate.

We havent seen this on ppc64 because our timer interrupt doesnt go via
the standard interrupt path (its a separate exception). IPIs do however
so Id expect these to be a problem for us.

Anton
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