Kernel PPS processing

Matthew Selsky Matthew.Selsky at
Wed Jun 29 18:55:23 UTC 2016

On Wed, Jun 29, 2016 at 11:48:08AM -0700, Hal Murray wrote:
> > Can you quantify the better?  I would have expected identical...
> Did you look at the graph?
> I'm not sure why you would expect performance to be identical.  Dave Mills 
> and crew went to a lot of effort to get code into various kernels, including 
> writing a RFC.  I'd be very surprised if it wasn't a significant improvement.
> The question in my mind is have things changed enough since 1994 so that we 
> can do as well without that code in the kernel?

We tested booting with "nohz=off intel_idle.max_cstate=0" and it made a difference in our production clocks.

I can try to get graphs if needed.


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