Hi all,
I am not sure if this topic is related to Perfmon2, but I think there should
be some more experienced people familiar with this...
I am trying to manually program on uncore MSRs to count some events, by
adding some system calls into the kernel to read/write those MSR registers.
The regular counting works(IA32_PERFEVTSELx and IA32_PMx), however, when I
tried to configure those uncore registers, it seems they do not count
anything, and the uncore_pmcs keep to be 0, whatever how I enable them. Here
is what I did:
Suppose I want to use the uncore pmc 0 to count UNC_DRAM_OPEN.CH0(Umask:
0x01, event number: 0x60)
I first set the first bit(EN_PC0) in MSR_UNCORE_PERF_GLOBAL_CTRL(address:
0x391), then I also set the EN bit in MSR_UNCORE_PERFEVTSEL0(address:
0x3B0) to be 1, and specify the umask and event select fields, by set the
whole stuff to be 0x00400160. Then I assume this counter starts working, and
I run piece of code. After that, I read the value back from
MSR_UNCORE_PMC0(address: 0x3C0), but I got 0 from this counter. And
actually I tried several uncore events and got all being 0. Did I miss
something or did I did it correctly?
Thanks,
Qingyuan
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