Re: [PATCH] clockevents: Per cpu tick skew boot option

From: Thomas Gleixner
Date: Tue May 08 2012 - 05:44:25 EST


On Tue, 8 May 2012, Mike Galbraith wrote:

> On Mon, 2012-05-07 at 21:17 +0200, Thomas Gleixner wrote:
> > On Sun, 6 May 2012, Mike Galbraith wrote:
> > >
> > > + skew_tick= [KNL] Offset the periodic timer tick per cpu to mitigate
> > > + xtime_lock contention on larger systems. Note: increases
> > > + power consumption, and should only be enabled if running
> > > + jitter sensitive (HPC/RT) workloads.
> > > +
> >
> > The "=" is wrong as skew_tick should not take parameters. It's
> > disabled by default. So "skew_tick" simply enables it, right ?
>
> Unless as I have RT set up, it's turned on by default, so '=' lets the
> user turn it back off.

Then the doc should say what's the parameter after the "+" is :)
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