From mboxrd@z Thu Jan  1 00:00:00 1970
From: Ian Campbell <ian.campbell@citrix.com>
Subject: Re: Problems with merlot* AMD Opteron 6376 systems (Was
 Re: stable trees
Date: Fri, 26 Jun 2015 21:07:59 +0100
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To: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: Lars Kurth <lars.kurth@citrix.com>, Jan Beulich <JBeulich@suse.com>, StefanoStabellini <stefano.stabellini@eu.citrix.com>, Andrew Cooper <Andrew.Cooper3@citrix.com>, Dario Faggioli <dario.faggioli@citrix.com>, Ian Jackson <Ian.Jackson@eu.citrix.com>, Aravind Gopalakrishnan <Aravind.Gopalakrishnan@amd.com>, suravee.suthikulpanit@amd.com, Anthony Perard <anthony.perard@citrix.com>, xen-devel <xen-devel@lists.xenproject.org>
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On Fri, 2015-06-26 at 15:36 -0400, Boris Ostrovsky wrote:
> On 06/26/2015 10:52 AM, Jan Beulich wrote:
> >>>> On 26.06.15 at 16:34, <ian.campbell@citrix.com> wrote:
> >> I did this using rdmsr from mst-tools instead, running on a native
> >> kernel gave:
> >>
> >> # for i in $(seq 0 31) ;do rdmsr -p $i MSR_K8_TOP_MEM2; done
> >> 0
> >> [...]
> >> 0
> 
> Is MSR_K8_TOP_MEM2 defined somewhere in the shell?

There is no $ there, so it wouldn't make any difference...

I had foolishly assumed that rdmsr would either know the names of the
MSRs or it would complain about a string it didn't understand which
wasn't a number.

Instead it just reads some random register which happens to be
strtoul("MSR_K8_TOP_MEM2"), how helpful.

> Just to make sure, could you use explicit address, i.e.
> 
>      for i in $(seq 0 31) ;do rdmsr -p $i 0xc001001d; done
> 
> (and if they are still all zeroes, can you read 0xc0010010 (SYSCFG) as 
> well?)

I'll try this next week.

Ian.