Re: [Xen-devel] realtime scheduling

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 8 Aug 2005, at 22:11, Holger Steinhaus wrote:

> Ok, done. I installed a fresh devel version of Xen (from Aug 7), 
> including kernel 2.6.12.3 and SEDF scheduling (in my original post: 
> Xen 2.0.7, kernel 2.6.11.12, original scheduler). The major change: 
> now the buffer problems even occur without any user domain.
> I tried to play around with the period/slice parameters, and found 
> some values that really boost the problems. As the HFC driver 
> generates 8000 interupts per second (I assume for timing purposes), 
> the desired period of 62500 ns is not possible on my machine. I think, 
> I'll take a closer look on the driver first...
If that can't be reduced then you really do need to dedicate a CPU or 
hyperthread to domain0. Otherwise the context switch overheads will 
kill you, even on a really fast CPU.
 -- Keir


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