Re: [Xen-devel] Problems with merlot* AMD Opteron 6376 systems (Was Re: stable trees

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 29.06.15 at 15:13, <boris.ostrovsky@xxxxxxxxxx> wrote:
> On 06/29/2015 06:23 AM, Ian Campbell wrote:
>> On Fri, 2015-06-26 at 21:07 +0100, Ian Campbell wrote:
>>> On Fri, 2015-06-26 at 15:36 -0400, Boris Ostrovsky wrote:
>>>> Just to make sure, could you use explicit address, i.e.
>>>>
>>>>       for i in $(seq 0 31) ;do rdmsr -p $i 0xc001001d; done
>> It reported 43f000000 on all processors on native (and only the first 8
>> on Xen due to limited dom0 vcpus).
>>
>>>> (and if they are still all zeroes, can you read 0xc0010010 (SYSCFG) as
>>>> well?)
>> It wasn't all zeroes, but anyway, it reported 740000 on all processors
>> on native (I forgot to run under Xen).
> 
> Thanks, so this means that we do have WB memory above 4G.

Good (because no fw problem) and bad (because still no reason for
the observed behavior).

> (And I am not sure I understand why Jan said MTRRs show that memory 
> above 4G is UC in 
> http://lists.xenproject.org/archives/html/xen-devel/2015-06/msg04397.html . 
> The log also seems to suggest that it is WB, doesn't it?)

How would it? The two MTRRs only cover the ranges 0-2G and
2G-3G afaics.

Jan


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