linux-kernel - Re: Linux 2.6.20-rc6

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Message-ID: <20070130065457.GA23390@elte.hu>
Date:	Tue, 30 Jan 2007 07:54:57 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Stephen Hemminger <shemminger@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Jeff Garzik <jeff@...zik.org>
Subject: Re: Linux 2.6.20-rc6 - sky2 resume breakage

* Linus Torvalds <torvalds@...ux-foundation.org> wrote:

> On Mon, 29 Jan 2007, Stephen Hemminger wrote:
> > 
> > On one and only one platform. It works fine on others. Don't blame 
> > the driver, stop it in PCI.
> 
> How sure are you that it's only those Sony laptops?

i'm wondering, could we go with Thomas' temporary patch that disables 
sky2 MSI if CONFIG_PM is enabled - we could revert that after 2.6.20. 
It's not like MSI is a life and death feature. On IO-APIC systems 
vectors are abundant and in any case we share irqs just fine. The true 
advantage of MSI is minimal. (MSI-X has the potential to be better by 
being message based, but in reality it still goes through the full IRQ 
layer.) MSI might be useful on really, really large systems - but i 
really hope those really large systems dont rely on CONFIG_PM. Meanwhile 
Thomas' patch maximizes the amount of working hardware (it has the 
chance to produce working systems in 100% of the cases) - which is a few 
orders of magnitude more important than IRQ management micro-costs. Am i 
missing anything?

	Ingo
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