linux-kernel - Re: [RFC][PATCH] IO-APIC blacklist

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Date:	Sat, 2 Jun 2007 19:33:40 -0400
From:	Len Brown <lenb@...nel.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Tear <tarrqt@...oo.com>, mingo@...hat.com,
	akpm@...ux-foundation.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Andi Kleen <ak@...e.de>
Subject: Re: [RFC][PATCH] IO-APIC blacklist

>   -uhci_hcd 0000:00:1f.2: irq 19, io base 0x0000ff80	 # slow
>   +uhci_hcd 0000:00:1f.2: irq 17, io base 0x0000ff80	 # fine

nope, this function is on on hardware IRQ 19 in both cases.

it just looks like IRQ 17 in the ACPI case due to this:

ACPI: PCI Interrupt 0000:00:1f.2[D] -> GSI 19 (level, low) -> IRQ 17

Totally bogus?  Yes.
google "Kill IRQ compression"
But while I truly hate this particular hack and I've wanted it gone for a long time,
it doesn't appear to be related to the failure at hand -- it just makes
it more irritating to debug.

-Len
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