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Subject: Re: [announce] [patch] limiting IRQ load, irq-rewrite-2.4.11-B5
To: hadi@cyberus.ca (jamal)
Date: Mon, 8 Oct 2001 17:11:03 +0100 (BST)
Cc: alan@lxorguk.ukuu.org.uk (Alan Cox),
        jgarzik@mandrakesoft.com (Jeff Garzik),
        andrea@suse.de (Andrea Arcangeli), mingo@elte.hu (Ingo Molnar),
        linux-kernel@vger.kernel.org (Linux-Kernel), netdev@oss.sgi.com,
        torvalds@transmeta.com (Linus Torvalds)
In-Reply-To: <Pine.GSO.4.30.0110081146050.5473-100000@shell.cyberus.ca> from "jamal" at Oct 08, 2001 11:57:11 AM
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From: Alan Cox <alan@lxorguk.ukuu.org.uk>
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> Agreed if you add the polling cardbus bit.
> Note polling cardbus would require more changes than the above.

I don't think it does. There are two pieces to the problem

	a)	Not dying horribly
	b)	Handling it elegantly

b) is driver specific (NAPI etc) and I think well understood to the point
its being used already for performance reasons

a) is as simple as 

	if(stuck_in_irq(foo) && irq_shared(foo))
	{
		disable_real_irq(foo);
		timer_fake_irq_foo();
	}

We know spoofing a shared irq is safe.

Alan
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