RHV: Migrating guest fails tests such as prime95 or linpack.

Solution In Progress - Updated -

Issue

  • Prime95 fails when the VM is live migrated:
[Work thread Jan 15 11:14] Test 1, 36000 Lucas-Lehmer iterations of M8716289 using AVX FFT length 448K, Pass1=448, Pass2=1K, clm=2.
[Work thread Jan 15 11:16] FATAL ERROR: Rounding was 0.5, expected less than 0.4
  • Linpack fails when the guest is live migrated:
=================== Timing linear equation system solver ===================
Size   LDA    Align. Time(s)    GFlops   Residual     Residual(norm) Check
14300  14300  1      40.612     48.0126  1.018849e+01 1.763139e+09   FAIL

Environment

Including, but not limited to:

  • Red Hat Virtualization 4.x
  • Red Hat Enterprise Linux 7.3 and 7.4 Hosts
  • Red Hat Enterprise Linux 6 and 7 Guests
  • Intel Sandy Bridge CPU or newer (AVX)

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