Re: 2.6.13-rc7-rt1

[Daniel Walker]

On Fri, 2005-08-26 at 08:43 +0200, Thomas Gleixner wrote:
> On Thu, 2005-08-25 at 18:15 -0700, Daniel Walker wrote:
> > On Fri, 2005-08-26 at 02:22 +0200, Thomas Gleixner wrote:
> > > On Thu, 2005-08-25 at 16:29 -0700, Daniel Walker wrote:
> > > > Devastating latency on a 3Ghz xeon .. Maybe the raw_spinlock in the
> > > > timer base is creating a unbounded latency?
> > > 
> > > The lock is only held for really short periods. The only possible long
> > > period would be migration of timers from a dead hotplug cpu to another.
> > > I guess thats not the case.
> > > 
> > > Do you have HIGH_RES_TIMERS enabled ?
> > 
> > No. The cascade has a very long worst case.
> 
> You mean the cascading from the outer to the inner wheels ? That should
> only happen with tons of active timers.

Right .. 

Daniel

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