Re: help with sandybridge/ivybridge hwpmc NUMA DRAM counters

On Wed, Apr 22, 2015 at 11:38:22PM -0700, Adrian Chadd wrote:

> hi all,
> 
> I'm having a spot of problem trying to get the local/remote dram
> counters working on the NUMA sandybridge and ivybridge systems here.
> 
> Things work fine using intel-pcm, but those same counters don't work with hwpmc.
> 
> Sandybridge - there's apparently an MSR that needs to be fiddled if
> the counters are active.
> 
> Ivybridge - the v1 and v2 chips have different local/remote dram
> counters, and on my v2 setup there's actually /two/ LOCAL_DRAM:

# pmccontrol -L | grep DRAM
        MEM_LOAD_UOPS_LLC_MISS_RETIRED.LOCAL_DRAM
	MEM_LOAD_UOPS_LLC_MISS_RETIRED.REMOTE_DRAM
		
CPU: Intel(R) Xeon(R) CPU E5-2650 v2 _at_ 2.60GHz (2600.05-MHz K8-class CPU)

> adrian_at_testbox1:~/git/github/erikarn/freebsd/sys/dev/hwpmc %
> pmccontrol -L | grep DRAM
>         MEM_LOAD_UOPS_LLC_MISS_RETIRED.LOCAL_DRAM
>         MEM_LOAD_UOPS_LLC_MISS_RETIRED.LOCAL_DRAM
>         MEM_LOAD_UOPS_LLC_MISS_RETIRED.REMOTE_DRAM
> 
> Now, i may be able to get to figuring this out at some point in the
> distant future, but I'd really appreciate any help I can get now. I'm
> now at the point with the NUMA affinity API stuff where I'm now
> chasing down when things are correctly working with local/remote RAM,
> and I'd really like to use hwpmc in sampling mode to work on it.
> 
> Thanks for any help!
> 
> 
> 
> -adrian
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