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authorBernd Faust <berndfaust@gmail.com>2012-12-05 15:16:49 +0100
committerJohn Stultz <john.stultz@linaro.org>2013-01-15 18:16:07 -0800
commit2353b47bffe4e6ab39042f470c55d41bb3ff3846 (patch)
tree75d4c5bd873f97c029530349f875153f0d68119a /tools/perf/scripts/python/export-to-postgresql.py
parentNTP: Add a CONFIG_RTC_SYSTOHC configuration (diff)
downloadlinux-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>
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