[time-nuts] NTP jitter with Linux

[Mike S]

On 4/4/2012 6:51 PM, Eric Williams wrote:
> Could the CPU be reducing its clock rate when it's not being loaded?  Just
> a guess, most multi-core processors these days have power saving features
> like that.
>
> On Wed, Apr 4, 2012 at 3:22 PM, Mike S<mikes at flatsurface.com>  wrote:
>> >  I've played around with different
>> >  cpufreq setting, thinking it might be related to the processor speed during
>> >  an IRQ varying, but that seems to have minimal impact (performance vs.
>> >  conservative vs. ondemand).

Setting /sys/devices/system/cpu/cpuX/cpufreq/scaling_governor to 
"performance" should lock that core to the max clock rate.

In looking that up, I found that the script I made to set this was just 
doing cpu0 (i.e. one of four cores). Doh! I've changed it to do all 4 
cores, and am trying that again to see if that's it.