Re: 2.6.14-rt13

[Fernando Lopez-Lezcano <nando@ccrma.Stanford.EDU>]

On Tue, 2005-11-15 at 10:08 +0100, Ingo Molnar wrote:
> i have released the 2.6.14-rt13 tree, which can be downloaded from the 
> usual place:
> 
>    http://redhat.com/~mingo/realtime-preempt/
> 
> lots of fixes in this release affecting all supported architectures, all 
> across the board. Big MIPS update from John Cooper.

Hi Ingo, I'm back from the trip and built -rt13 to test on my dual core
Athlons. As I emailed you yesterday off the list it looked good, but I
guess it took longer than usual for things to degrade. This morning I'm
seeing the usual warnings from Jack. And, for the first time in a while,
actual xruns. I'll try your suggestion of booting with idle=poll. 

[begin speculation]
You mentioned before that the TSC's from both cpus could drift from each
other over time. Assuming that is the source of timing (I have no idea)
that could explain the behavior of Jack, it gets a reference time from
one of the cpus and then compares that with what it gets from either cpu
depending on where it is running at a given time. If it is the same cpu
all is fine, if it is the other and it has drifted then the warning is
printed. 

-- Fernando


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