| Re: [chrony-dev] PPSAPI: kernel consumer |
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On Mon, Feb 08, 2010 at 02:30:32PM +0100, Håkan Johansson wrote:
> The measurements:
>
> AMD 1050 MHz, back-to-back getnstimeofday takes 62 ns
> Pentium M 1600 Mhz, back-to-back getnstimeofday takes 560 ns
> Athlon 2000 MHz, back-to-back getnstimeofday takes 560 ns
>
> All systems single-core. Where I had available, I changed the
> timesource between acpi_pm and tsc with
> /sys/devices/system/clocksource/clocksource0/current_clocksource.
> No major effect.
Interesting. Not sure how clock_gettime differs from getnstimeofday,
but my measurements are:
Athlon K8 2.0 GHz single core: 30 ns (tsc), 838ns (acpi_pm)
Core 2 2.4 GHz dual core: 60 ns (tsc)
Pentium 4 2.8 GHz hyper threading: 105 ns (tsc)
--
Miroslav Lichvar
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