Re: [Xen-devel] [PATCH v10 09/25] x86: refactor psr: L3 CAT: set value: implement framework.

[Yi Sun <yi.y.sun@xxxxxxxxxxxxxxx>]

On 17-04-25 02:24:40, Jan Beulich wrote:
> >>> On 25.04.17 at 09:15, <yi.y.sun@xxxxxxxxxxxxxxx> wrote:
> > Sorry, this may cause potential issue and is not a good example. But from SW
> > view, there is another case where the per-socket supporting is important in
> > real-time scenarios. You may have a real-time domain on one socket that 
> > requires
> > different masks (especially for code/data) to guarantee its performance vs.
> > other general-purpose domains run on a different socket. In that case it’s a
> > heterogeneous software usage model (rather than heterogeneous hardware). 
> > And,
> > we should not force same masks setting on different sockets in such case.
> 
> I don't follow: The COS IDs for the real-time and general purpose
> domains would be different, wouldn't they? Thus there would be
> different masks in use, as intended.
> 
Yes, you are right. But as above case, the real-time domain only runs on one
socket. If per-socket supporting is enabled, we can allocate this COS ID to
other domains on other sockets. This can help to improve the scarce cache
utilization.

> Jan

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