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| author |   Bernd Faust <berndfaust@gmail.com> | 2012-12-05 15:16:49 +0100 |
|---|---|---|
| committer |   John Stultz <john.stultz@linaro.org> | 2013-01-15 18:16:07 -0800 |
| commit | 2353b47bffe4e6ab39042f470c55d41bb3ff3846 (patch) | |
| tree | 75d4c5bd873f97c029530349f875153f0d68119a /tools/perf/scripts/python/export-to-postgresql.py | |
| parent | NTP: Add a CONFIG_RTC_SYSTOHC configuration (diff) | |
| download | linux-dev-2353b47bffe4e6ab39042f470c55d41bb3ff3846.tar.xz linux-dev-2353b47bffe4e6ab39042f470c55d41bb3ff3846.zip | |
Round the calculated scale factor in set_cyc2ns_scale()
During some experiments with an external clock (in a FPGA), we saw that
the TSC clock drifted approx. 2.5ms per second.
This drift was caused by the current way of calculating the scale.
In our case cpu_khz had a value of 3292725. This resulted in a scale
value of 310. But when doing the calculation by hand it shows that the
actual value is 310.9886188491, so a value of 311 would be more precise.
With this change the value is rounded.
Signed-off-by: Bernd Faust <berndfaust@gmail.com>
Signed-off-by: John Stultz <john.stultz@linaro.org>
Diffstat (limited to 'tools/perf/scripts/python/export-to-postgresql.py')
0 files changed, 0 insertions, 0 deletions