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

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Message-ID: <alpine.LFD.0.98.0706020938490.23741@woody.linux-foundation.org>
Date:	Sat, 2 Jun 2007 09:39:47 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Tear <tarrqt@...oo.com>
cc:	mingo@...hat.com, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC][PATCH] IO-APIC blacklist



On Sat, 2 Jun 2007, Tear wrote:
> 
> I own a Dell OptiPlex GX240 which, when ACPI is disabled
> but IO-APIC is enabled, shows very slow USB performance.
> I thought that this could be related to IO-APIC and
> tried to boot with "noapic" appended to the kernel
> command line. This way the USB transfer speed returned
> to normal values.

Well, it's almost certainly not the IO-APIC per se.

It's more likely to be some irq routing issue, where ACPI fixes up 
something.  Do you have diffs of 'dmesg' with and without ACPI?

		Linus
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