Bug 1429990

Summary: papi L1 cache events are incorrect on POWER8
Product: [Fedora] Fedora Reporter: Michael Petlan <mpetlan>
Component: papiAssignee: William Cohen <wcohen>
Status: CLOSED EOL QA Contact: Michael Petlan <mpetlan>
Severity: unspecified Docs Contact:
Priority: unspecified    
Version: 25CC: wcohen
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Hardware: powerpc   
OS: Unspecified   
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Last Closed: 2017-12-12 10:52:38 UTC Type: Bug
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description Michael Petlan 2017-03-07 15:46:56 UTC 
Description of problem:
# ./ctests/tenth 
Test case 10: start, stop for derived event PAPI_L1_DCA.
--------------------------------------------------------
Default domain is: 1 (PAPI_DOM_USER)
Default granularity is: 1 (PAPI_GRN_THR)
Using 100 iterations of c += a*b
Repeated 10 times
-------------------------------------------------------------------------
Test type   :          min          max          sum
PAPI_L1_DCA:         65535    207667972   2076595932
PAPI_L1_DCW:         65535      8651223     86511103
PAPI_L1_DCR:         65535      8650582     86503926
-------------------------------------------------------------------------
Verification:
Sum 1 approximately equals sum 2 + sum 3 or    173015029
percent error: 91.668332
tenth.c                                     FAILED
Line # 220
Error: PAPI_L1_DCA

Version-Release number of selected component (if applicable):
papi-5.4.3-2.fc24.ppc64le

How reproducible:
100% on POWER8

Steps to Reproduce:
1. run ctests/tenth testcase
2.
3.

Actual results:

as above...

Expected results:

--------------------------------------------------------
Default domain is: 1 (PAPI_DOM_USER)
Default granularity is: 1 (PAPI_GRN_THR)
Using 100 iterations of c += a*b
Repeated 10 times
-------------------------------------------------------------------------
Test type   :          min          max          sum
PAPI_L1_DCA:         65535     17316351    173122133
PAPI_L1_DCW:         65535      8650804     86504471
PAPI_L1_DCR:         65535      8659023     86567374
-------------------------------------------------------------------------
Verification:
Sum 1 approximately equals sum 2 + sum 3 or    173071845
percent error: 0.029048
tenth.c                                     PASSED


Additional info:

POWER7 looks OK.

The equation DCA = DCW + DCR should roughly apply to the results.
Comment 1 Michael Petlan 2017-03-07 16:05:02 UTC 
It is strange that RHEL-7.3 seems to have the same settings, but the same test passes there even on POWER8.

So, with RHEL-7.3, both POWER7 and POWER8 pass.
With Fedora, POWER7 passes, POWER8 fails.
Comment 2 Fedora End Of Life 2017-11-16 18:52:03 UTC 
This message is a reminder that Fedora 25 is nearing its end of life.
Approximately 4 (four) weeks from now Fedora will stop maintaining
and issuing updates for Fedora 25. It is Fedora's policy to close all
bug reports from releases that are no longer maintained. At that time
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Comment 3 Fedora End Of Life 2017-12-12 10:52:38 UTC 
Fedora 25 changed to end-of-life (EOL) status on 2017-12-12. Fedora 25 is
no longer maintained, which means that it will not receive any further
security or bug fix updates. As a result we are closing this bug.

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