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Date: Thu, 03 Jun 2010 17:14:50 -0400
From: Prarit Bhargava <prarit@redhat.com>
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To: Yinghai Lu <yinghai.lu@oracle.com>
CC: Cyrill Gorcunov <gorcunov@gmail.com>, linux-kernel@vger.kernel.org,
       linux-acpi@vger.kernel.org, mjg@redhat.com, x86@kernel.org,
       Thomas Gleixner <tglx@linutronix.de>, "H. Peter Anvin" <hpa@zytor.com>,
       Suresh Siddha <suresh.b.siddha@intel.com>
Subject: Re: [PATCH]: x86: use acpi flags for apic mapping
References: <20100602192418.2706.35192.sendpatchset@prarit.bos.redhat.com> <20100602194956.GB5264@lenovo> <4C06D91F.2060105@redhat.com> <20100603172126.GA5502@lenovo> <4C07EF69.6050301@redhat.com> <4C0817CE.6050006@oracle.com>
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> 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?

P.

> Thanks
>
> Yinghai
>
>