possible to include sampling_down_factor in Ubuntu?

Robie Basak robie.basak at ubuntu.com
Tue Nov 19 10:09:32 UTC 2013

On Mon, Nov 18, 2013 at 03:21:49PM -0500, Daniel Hollocher wrote:
> So again, how could this be "fixed" in Ubuntu?  If there are hardware
> specific optimal values for sampling_down_factor, how would that get
> included into Ubuntu?

Am I right in understanding that this value can be changed at runtime?
Or is it a kernel compile-time option?

If runtime, then presumably there would have to be some userspace logic
that detects what your system is and maps that to a preferred value.
Perhaps it would examine /proc/cpuinfo or run dmidecode or something. Is
this accurate?

If so, then would a sensible first step be to implement this command in
a userspace package?

AFAICS this command would be the hard part, but doesn't require thought
about integration, since it would be a separate piece anyway.

Then the command might be extended to adjust the tunable itself with an
option, and then the packaging might be extended to add an init script
that does this on startup.

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