ehmry/genode
ehmry/genode
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

x86 cpu_quota: lower error tolerance

Browse Source 
Previously, on X86, the timer driver used the PIT with a maximum timeout
of 54 ms.  Thus, the driver frequently interrupted the counters with
highest priority to update the timer. This is why we needed a higher
error tolerance as for ARM where the driver, once configured, can sleep
for the whole test timeout. Now, we use the kernel timer and the problem
seems to be exits no longer.

Ref #2304
This commit is contained in:
Martin Stein 2017-03-02 18:42:04 +01:00 committed by Christian Helmuth
parent 574a1bd198
commit b05b5616c8
1 changed files with 0 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
repos/os/run/cpu_quota.run
View File

@ -139,15 +139,6 @@ proc check_counter { name opt cnt total_cnt } {
set tol 0.01
set is 0
#
# On X86, the timer driver uses the PIT with a maximum timeout of 54 ms.
# Thus, the driver frequently interrupts the counters with highest
# priority to update the timer. This is why we need a higher error
# tolerance as for ARM where the driver, once configured, can sleep for
# the whole test timeout.
#
if {[have_spec x86]} { set tol 0.02 }
#
# Zynq is currently tested merely in Qemu and most likely because of
# that, the results are less precise.