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Re: [Xen-devel] realtime scheduling

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 and SEDF scheduling (in my original post: Xen 2.0.7, kernel, 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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