linux-kernel - RE: x86_mce: mce_start uses number of phsical cores instead of logical cores

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Message-ID: <3908561D78D1C84285E8C5FCA982C28F2DA4C9B9@ORSMSX106.amr.corp.intel.com>
Date:	Fri, 10 May 2013 19:09:32 +0000
From:	"Luck, Tony" <tony.luck@...el.com>
To:	Ming Lei <Ming.Lei@...erbed.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:	"mchehab@...hat.com" <mchehab@...hat.com>,
	"bp@...en8.de" <bp@...en8.de>
Subject: RE: x86_mce: mce_start uses number of phsical cores instead of
 logical cores

> With hyperthread turns on, the num_online_cpus reports the number of all logical cores.
> What I found in testing is only half the cores receives the mce broadcast, so I assume only the physical cores get broadcast.

See Intel Software Developer Manual Volume 3B Section 15.10.4.1, 3rd bullet:

   o For processors on which CPUID reports DisplayFamily_DisplayModel as 06H_0EH and onward, an MCA signal is
      broadcast to all logical processors in the system

Your E-5645 processors are a lot newer than this cut-off version - so they should broadcast
to all your threads.

You are seeing something very strange.  It would be interesting to know *which* 12 cpus
show up for your machine check.  Perhaps you are seeing all the hyperthreads from one
socket and none from the other?

I still suspect that something is strange in the EDAC error injection side of this problem
and that you are not getting a h/w initiated INT#18 event.

-Tony

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