Re: [Xen-devel] Xen-4.5 Testing - Cache Monitoring Technology

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

On 20/11/14 10:15, Chao Peng wrote:
> On Thu, Nov 20, 2014 at 09:58:37AM +0000, Andrew Cooper wrote:
>> Hi,
>>
>> I have found myself a PSR-capable server and have been having a play
>> with Xen-4.5
>>
>> At a first pass, I can get some numbers out:
>>
>> [root@blob ~]# xl psr-cmt-attach 0
>> [root@blob ~]# xl psr-cmt-show cache_occupancy
>> Total RMID: 71
>> Name                                        ID        Socket 0       
>> Socket 1
>> Total L3 Cache Size                                   46080 KB       
>> 46080 KB
>> Domain-0                                     0        45072
>> KB            0 KB
>> [root@blob ~]#
>>
>> However, I am unable to get any occupancy information for HVM guests. 
>> Given nothing obvious in the code which would make CMT PV-guest
>> specific, I presume this is unexpected?
>>
>>
> Thank your for trying...
> But I just tested the HVM on my box and it runs correct.
>
> Have you missed to run psr-cmt-attach for your HVM domain? Otherwise I
> think there may be something wrong.

No - I get the HVM domain (a memtest domain) listed in the output.  It
is clear from Dom0's occupancy dropping off significantly that
competition is underway on Socket 0 (as expected), but the domain always
has 0 occupancy reported.

I shall investigate.

~Andrew

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