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cpu_quota hw exynos5: raise error tolerance

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From our observations we can tell that the error should not exceed 4%.
However, there is no reasonable explanation by now why the test results
are less stable on these platforms. We have tried several things that
did not lead to an explanation or improvement:

  * changing the timing parameters of the scheduler
  * switching off SMP
  * double-checking the speed of userland and kernel timers

Ref #1805
This commit is contained in:
Martin Stein 2015-12-02 13:25:05 +01:00 committed by Christian Helmuth
parent 227b539193
commit 01643ccd94
1 changed files with 12 additions and 0 deletions
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12
repos/os/run/cpu_quota.run
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@ -160,6 +160,18 @@ proc check_counter { name opt cnt total_cnt } {
#
if {[have_spec zynq_qemu]} { set tol 0.03 }
#
# FIXME: There is no reasonable explanation by now why the test results
# are less stable on these platforms. We have tried several things that
# did not lead to an explanation or improvement:
#
# * changing the timing parameters of the scheduler
# * switching off SMP
# * double-checking the speed of userland and kernel timers
#
if {[have_spec hw_odroid_xu]} { set tol 0.04 }
if {[have_spec hw_arndale]} { set tol 0.04 }
if {[expr $total_cnt != 0]} { set is [expr double($cnt) / $total_cnt ] }
set err [expr $is - $opt]