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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 16:22:16 +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.4.30.0110081106500.5473-100000@shell.cyberus.ca> from "jamal" at Oct 08, 2001 11:09:57 AM
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From: Alan Cox <alan@lxorguk.ukuu.org.uk>
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> On Mon, 8 Oct 2001, Alan Cox wrote:
> 
> > NAPI is important - the irq disable tactic is a last resort. If the right
> > hardware is irq flood aware it should only ever trigger to save us from
> > irq routing errors (eg cardbus hangs)
> 
> Agreed. As long as the IRQ flood protector can do proper isolation.
> Here's hat i see on my dell latitude laptop with a built in ethernet (not
> cardbus related ;->)

It doesnt save you from horrible performance. NAPI is there to do that, it
saves you from a dead box. You can at least rmmod the cardbus controller
with protection in place (or go looking for the problem with a debugger)
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