Re: Question about the CAT and CMT in Xen

[Andrew Cooper <andrew.cooper3@citrix.com>]

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On 31/08/15 18:42, Meng Xu wrote:
> Hi Chao,
>
> I'm Meng Xu from the University of Pennsylvania.
>
> We purchased a computer that has Intel(R) Xeon(R) CPU E5-2618L v3 @
> 2.30GHz inside.
> According to
> http://www.intel.com/content/www/us/en/communications/cache-monitoring-cache-allocation-technologies.html,
> Intel E5-2618L v3 should support both CAT and CMT.
>
> I'm playing the latest Xen on the machine to evaluate how CAT and CMT
> work
> ​.​
>
>
> The commit point I used is in the staging branch, commit
> 7b99717f62caeac08eea224a177cd28f047ac4b5, which was push on Aug. 17th,
> 2015.
> I checked that the branch has merged your code.
>
> After I boot up the system, I tried the following commands and it
> shows some errors.
>
> ​***​
> My question is
> ​***​
> :
> 1) Is there any specific BIOS configuration I need to configure?
> 2) The CMT is not enabled by default. Do I need to issue any command
> to enable it?  I didn't find any document about how to enable it,
> according to
> http://xenbits.xen.org/docs/unstable-staging/misc/xl-psr.html. :-(
> 3) I'm not 100% sure if this machine we purchased supports the CAT.
> Right now, it shows "No such device" on the machine.
> ​ But it may probably because the hypervisor forgot to initialize it?​
>
>
> Below is the details of what I tried:
>
> # xl psr-hwinfo
> Cache Monitoring Technology (CMT):
> Enabled         : 0
> Cache Allocation Technology (CAT):
> libxl: error: libxl_psr.c:96:libxl__psr_cat_log_err_msg: CAT is not
> supported in this system: No such device
> Failed to get cat info
>
> #xl psr-cmt-attach 0
> libxl: error: libxl_psr.c:70:libxl__psr_cmt_log_err_msg: CMT is not
> supported in this system: No such device
>
> Please let me know if you need any further information to confirm if
> the machine support the CAT or if it's because there is some issue
> with the software layer. :-)
>
> Thank you very much for your time and help in this question!
>
> Best regards,
>
> Meng

To get started, use "psr=cat,cmt" on the Xen command line.  Neither are
enabled by default as they can potentially allocate quite a lot of
resources behind the scenes.

~Andrew

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