linux-kernel - Re: [PATCH -v3 0/4] x86, usb, pci: Disable usb legacy support early

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Date:	Mon, 10 Jan 2011 17:25:56 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	Greg KH <greg@...ah.com>
CC:	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	linux-usb@...r.kernel.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH -v3 0/4] x86, usb, pci: Disable usb legacy support early

On 01/10/2011 05:07 PM, Greg KH wrote:
> On Mon, Jan 10, 2011 at 04:49:02PM -0800, Yinghai Lu wrote:
>>
>> Move quirks for usb handoff early for x86.
>>
>> So we can get stable result when trying to calibrate apic timer with pm-timer.
> 
> I still fail to understand _why_ you are making these changes.
> 
> Exactly what problem do you currently have, on what hardware, that this
> patch set solves?
1. remove the warning 
2. apic timer clockevent will be more accurate instead of use PM to calibrate it.

on Intel newer system with 128 logical cpus or more.

guess SMI handler for USB legacy support may need more time coordinate between those cpus.

Thanks

Yinghai 
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