linux-kernel - Re: [PATCH]: x86: use acpi flags for apic mapping

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Message-ID: <4C081F0C.8060504@oracle.com>
Date:	Thu, 03 Jun 2010 14:30:52 -0700
From:	Yinghai Lu <yinghai.lu@...cle.com>
To:	Prarit Bhargava <prarit@...hat.com>
CC:	Cyrill Gorcunov <gorcunov@...il.com>, linux-kernel@...r.kernel.org,
	linux-acpi@...r.kernel.org, mjg@...hat.com, x86@...nel.org,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Suresh Siddha <suresh.b.siddha@...el.com>
Subject: Re: [PATCH]: x86: use acpi flags for apic mapping

On 06/03/2010 02:14 PM, Prarit Bhargava wrote:
> 
>> It seems we don't need this patch.
>>
>> so all system should support phys apic mode, but system with less 8 cpus is supposed to support cluster mode for better performance.
>>
>> current kernel will try to use cluster mode if nr_cpus is less than 8.
>>
>> some system have problem like IBM and NCR only support phys apic mode even cpus < 8 ...
>>
>>   
> 
> What about systems that have set the ACPI values?  We just ignore those
> then?
we checked the value to see if it only support phys apic mode.

Yinghai
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