linux-kernel - Re: [PATCH 0/5 v3] x86: adapt CPU topology detection for AMD Magny-Cours

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Date:	Thu, 11 Jun 2009 17:38:37 +0200
From:	Andreas Herrmann <andreas.herrmann3@....com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>, linux-kernel@...r.kernel.org,
	Bert Wesarg <bert.wesarg@...glemail.com>
Subject: Re: [PATCH 0/5 v3] x86: adapt CPU topology detection for AMD
	Magny-Cours

On Sun, Jun 07, 2009 at 03:40:09PM +0200, Ingo Molnar wrote:
> 
> * Andreas Herrmann <andreas.herrmann3@....com> wrote:
> 
> > Changes to previous patch set:
> > - remove MULTI_NODE_CPU config option
> > - provide defaults for cpu_node topology information
> > - add patch to fix AMD mcheck code
> > 
> > Current patch set contains 5 patches:
> > - patch 1 adapts common code to show cpu_node_id,
> >   cpu_node_siblings and cpu_node_siblings_list in
> >   /sys/devices/system/cpu/cpu*/topology
> > - patch 2 prepares arch/x86 to provide cpu_node information
> > - patch 3 sets up cpu_node information for AMD Magny-Cours CPU
> > - patch 4 fixes L3 cache information for Magny-Cours
> > - patch 5 fixes mcheck code for Magny-Cours
> 
> it would be really nice to propagate this info to where it _really_ 
> matters: the sched-domains topology info - unless i'm missing 
> something this patch-set does not do that yet, right?

No scheduler modifcations contained in this patch set.

> That way we'll get actual feedback if it's broken, and will help
> people if it works right. Device allocation matters too, but to a
> much lesser degree.

With and w/o this patch set scheduler is broken for Magny-Cours.

When performing

 # echo 2 >> /sys/devices/system/cpu/sched_mc_power_savings

I get (both with and without above patches):

  CPU23 attaching sched-domain:
   domain 0: span 12-23 level MC
    groups: 23 12 13 14 15 16 17 18 19 20 21 22
  ERROR: parent span is not a superset of domain->span
    domain 1: span 18-23 level CPU
  ERROR: domain->groups does not contain CPU23
     groups: 12-17 (__cpu_power = 12288)
  ERROR: groups don't span domain->span
     domain 2: span 0-23 level NODE
      groups:
  ERROR: domain->cpu_power not set

  ERROR: groups don't span domain->span

Output is from dmesg -- copied just the lines form the last CPU.

I'd appreciate if you'd pull this patch set for .31. (Maybe I have
to prepare an updated version to avoid conflicts.)

I am working on the scheduler front. But don't know when
first patches will be ready for review.


Regards,
Andreas

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