[ntp:questions] NTP + kernel frequency
Jan Ceuleers
janspam.ceuleers at skynet.be
Sat Nov 10 08:45:08 UTC 2007
Per Hedeland wrote:
> On Linux, a simpler way can be to look at /proc/interrupts - e.g.
> (probably Linux-version- and possibly config-specific):
>
> $ (cat /proc/interrupts; sleep 10; cat /proc/interrupts) | \
> awk '/timer/{prev=now; now=$2} END{printf "%dHz\n", int((now-prev)/10)}'
This yields 41Hz on my Via C7 machine (which has frequency scaling and
runs a 2.6.22-based kernel) while it's idle, and a higher number (e.g.
90Hz) while it's doing something. It yields 100Hz on a Soekris 4801
running 2.4.31.
In other words, this method doesn't seem to be entirely reliable,
possibly as a side effect of frequency scaling.
Cheers, Jan
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