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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()
Date: Tue, 11 Nov 2003 10:00:42 +1100	[thread overview]
Message-ID: <20031110230042.GF930@krispykreme> (raw)
In-Reply-To: <20031110215844.GC21632@sgi.com>

 
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

  reply	other threads:[~2003-11-10 23:05 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2003-11-10 21:58 hot cache line due to note_interrupt() Jack Steiner
2003-11-10 23:00 ` Anton Blanchard [this message]
2003-11-11  8:29 ` Ravikiran G Thirumalai
2003-11-11 16:25   ` Anton Blanchard
2003-11-11 19:58   ` Andrew Morton
2003-11-14 17:45     ` Jack Steiner
2003-11-14 17:57       ` Andrew Morton
2003-11-14 18:11         ` Jack Steiner
2003-11-14 18:10       ` David Mosberger
2003-11-14 18:17       ` Linus Torvalds
2003-11-15  5:18         ` Jeff Garzik
2003-11-14 19:10       ` Anton Blanchard
2003-11-14 19:28         ` Mike Fedyk

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