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Subject: Re: 2.6.13-rc7-rt1
From: Daniel Walker <dwalker@mvista.com>
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Cc: Ingo Molnar <mingo@elte.hu>, linux-kernel@vger.kernel.org
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Date: Thu, 25 Aug 2005 18:15:44 -0700
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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.

Daniel