Date: Wed, 22 Apr 2015 23:38:22 -0700 From: Adrian Chadd <adrian@freebsd.org> To: "freebsd-arch@freebsd.org" <freebsd-arch@freebsd.org>, freebsd-current <freebsd-current@freebsd.org> Subject: help with sandybridge/ivybridge hwpmc NUMA DRAM counters Message-ID: <CAJ-VmomZNDFE9%2BQJhZ2H8aRmCbk7RNrk%2BUyUA5_KK2z=yHkiyA@mail.gmail.com>
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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:
adrian@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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