netdev - Re: [PATCH 10/11][TG3]: Reduce spurious interrupts.

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Message-ID: <1178562469.4859.70.camel@dell>
Date:	Mon, 07 May 2007 11:27:49 -0700
From:	"Michael Chan" <mchan@...adcom.com>
To:	"Rick Jones" <rick.jones2@...com>
cc:	"David Miller" <davem@...emloft.net>, jeff@...zik.org,
	"netdev" <netdev@...r.kernel.org>
Subject: Re: [PATCH 10/11][TG3]: Reduce spurious interrupts.

On Mon, 2007-05-07 at 09:39 -0700, Rick Jones wrote:
> On how "topologically big" a system has this resurrection of the PIO read been 
> tried so far?
> 

If you're asking how much impact the read will have on performance, the
answer is that it will depend on whether you frequently get spurious
interrupts or not without the read.  The read itself has a measurable
impact on performance, but it will offset the performance hit of
entering the IRQ handler twice if you get frequent spurious interrupts.
It also prevents the kernel from shutting down the IRQ in some extreme
cases.

If you get spurious interrupts infrequently, the read is unfortunately a
net loss.

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