[ntp:questions] NTP + kernel frequency

Hal Murray hal-usenet at ip-64-139-1-69.sjc.megapath.net
Sat Nov 10 17:07:21 UTC 2007


>> 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.

There is a lot of work going on in the Linux kernel to avoid
unnecessary timer interrupts in order to save power on laptops
and other systems running off batteries.

-- 
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