Messages in this thread | | | Date | Wed, 11 Sep 2013 09:50:18 -0700 | From | Andi Kleen <> | Subject | Re: [PATCH] perf,x86: add constraint for IVB CYCLE_ACTIVITY:CYCLES_LDM_PENDING |
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On Wed, Sep 11, 2013 at 08:22:22AM -0700, Stephane Eranian wrote: > > The IvyBridge event CYCLE_ACTIVITY:CYCLES_LDM_PENDING can only > be measured on counters 0-3 when HT is off. When HT is on, you > only have counters 0-3. > > If you program it on the eight counters for 1s on a 3GHz > IVB laptop running a noploop, you see: > > 2 747 527 CYCLE_ACTIVITY:CYCLES_LDM_PENDING > 2 747 527 CYCLE_ACTIVITY:CYCLES_LDM_PENDING > 2 747 527 CYCLE_ACTIVITY:CYCLES_LDM_PENDING > 2 747 527 CYCLE_ACTIVITY:CYCLES_LDM_PENDING > 3 280 563 608 CYCLE_ACTIVITY:CYCLES_LDM_PENDING > 3 280 563 608 CYCLE_ACTIVITY:CYCLES_LDM_PENDING > 3 280 563 608 CYCLE_ACTIVITY:CYCLES_LDM_PENDING > 3 280 563 608 CYCLE_ACTIVITY:CYCLES_LDM_PENDING > > Clearly the last 4 values are bogus.
Thanks looks good.
Likely need it on Haswell too?
-Andi
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