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From: Ravikiran Thirumalai <kiran@scalemp.com>
To: Yinghai Lu <yhlu.kernel@gmail.com>
Cc: Andi Kleen <andi@firstfloor.org>, Ingo Molnar <mingo@elte.hu>,
	Andrew Morton <akpm@linux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	shai@scalemp.com
Subject: Re: [PATCH] x86_64: make amd quad core 8 socket system not be clustered_box v2
Date: Tue, 26 Feb 2008 15:31:11 -0800	[thread overview]
Message-ID: <20080226233111.GA9734@localdomain> (raw)
In-Reply-To: <86802c440802261516n1ca8ef6eh5e6abdd0c3f959dd@mail.gmail.com>

On Tue, Feb 26, 2008 at 03:16:16PM -0800, Yinghai Lu wrote:
>On Tue, Feb 26, 2008 at 1:24 PM, Ravikiran Thirumalai <kiran@scalemp.com> wrote:
>>
>> On Tue, Feb 26, 2008 at 01:10:57PM -0800, Yinghai Lu wrote:
>>  >On Tue, Feb 26, 2008 at 12:32 PM, Ravikiran Thirumalai
>>  ><kiran@scalemp.com> wrote:
>>  >> On Tue, Feb 26, 2008 at 11:00:58AM -0800, Yinghai Lu wrote:
>>  >>  >
>>  >>  >1. if acpi=off ?
>>  >>
>>  >>  Well that is not a realistic scenario for any multi chassi NUMA machine,
>>  >>  since the proximity information is very important and turning acpi off
>>  >>  deprives the OS of this information.
>>  >
>>  >actually OS should detect the distance instead of rely on SLIT.
>>
>>  How does it do that?  ACPI SRAT is needed to determine this, and it wouldn't
>>  work if acpi=off.
>
>srat only have apicid to node mapping, and ram to node mapping.

Which is very important for performance.

>
>for amd64 system, when acpi=off
>ram to node mapping can be retrieved from pci conf space

I was referring to all types of numa systems, not just AMD.  The pci config
space is amd specific.  Multi chassi systems in particular would be
acpi SRAT based.  Anyways.

Kiran

  reply	other threads:[~2008-02-26 23:31 UTC|newest]

Thread overview: 48+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-02-21 10:58 [PATCH] x86_64: make amd quad core 8 socket system not be clustered_box Yinghai Lu
2008-02-22 12:25 ` Andi Kleen
2008-02-22 19:02   ` Yinghai Lu
2008-02-22 19:00     ` Andi Kleen
2008-02-22 19:04       ` Yinghai Lu
2008-02-22 19:07         ` Andi Kleen
2008-02-22 19:07           ` Yinghai Lu
2008-02-22 19:10             ` Andi Kleen
2008-02-23  8:55               ` Yinghai Lu
2008-02-24  5:48       ` [PATCH] x86_64: make amd quad core 8 socket system not be clustered_box v2 Yinghai Lu
2008-02-24  7:50         ` Ingo Molnar
2008-02-24 12:29         ` Andi Kleen
2008-02-24 23:00           ` Yinghai Lu
2008-02-25  1:52             ` Yinghai Lu
2008-02-25  2:32             ` Yinghai Lu
2008-02-25  5:36               ` [PATCH] x86_64: for apic_is_clustered_box for vsmp v2 Yinghai Lu
2008-02-25  6:43                 ` [PATCH] x86: vSMP selection in config Yinghai Lu
2008-02-26 19:40                   ` Kconfig configuration restore bug [Was: x86: vSMP selection in config] Sam Ravnborg
2008-02-27  2:59                     ` Roman Zippel
2008-02-29  4:09                     ` [PATCH 1/3] fix recursive dependencies Roman Zippel
2008-02-29  5:05                       ` Yinghai Lu
2008-02-29 13:22                         ` Roman Zippel
2008-02-29 17:40                           ` Sam Ravnborg
2008-02-29 20:05                             ` Ingo Molnar
2008-02-29 20:04                       ` Ingo Molnar
2008-02-29  4:10                     ` [PATCH 2/3] fix choice dependency check Roman Zippel
2008-04-28 21:08                       ` Sam Ravnborg
2008-02-29  4:11                     ` [PATCH 3/3] add named choice group Roman Zippel
2008-02-26 20:05                   ` [PATCH] x86: vSMP selection in config Sam Ravnborg
2008-02-26 21:03                     ` Yinghai Lu
2008-02-25  5:39           ` [PATCH] x86_64: make amd quad core 8 socket system not be clustered_box v2 Yinghai Lu
2008-02-25 19:08           ` Ravikiran Thirumalai
2008-02-25 22:05             ` Yinghai Lu
2008-02-26  3:39               ` Ravikiran Thirumalai
2008-02-26  3:46                 ` Andi Kleen
2008-02-26  4:05                   ` Ravikiran Thirumalai
2008-02-26  5:27                     ` Yinghai Lu
2008-02-26 18:42                       ` Ravikiran Thirumalai
2008-02-26 19:00                         ` Yinghai Lu
2008-02-26 20:32                           ` Ravikiran Thirumalai
2008-02-26 21:09                             ` Yinghai Lu
2008-02-26 21:10                             ` Yinghai Lu
2008-02-26 21:24                               ` Ravikiran Thirumalai
2008-02-26 23:16                                 ` Yinghai Lu
2008-02-26 23:31                                   ` Ravikiran Thirumalai [this message]
2008-02-26 23:41                                     ` Yinghai Lu
2008-02-22 19:08     ` [PATCH] x86_64: make amd quad core 8 socket system not be clustered_box Yinghai Lu
2008-02-22 18:59       ` Andi Kleen

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