Re: [Embedded-pv-devel] [PATCH v10] xen: add para-virtual sound interface header file

[Oleksandr Andrushchenko <andr2000@xxxxxxxxx>]

On 11/25/2016 09:14 AM, Jan Beulich wrote:
> > > > On 24.11.16 at 18:25, <julien.grall@xxxxxxx> wrote:
> > On 24/11/16 17:11, Oleksandr Andrushchenko wrote:
> > > That is because we want to be cache line aligned.
> > But this is only accurate to your platform. There is HW available with
> > 128 bytes.
> >
> > For instance on Xen ARM, all the structures are aligned to 128 bytes in
> > order to fit in most of cache line. Although technically it would be
> > possible have bigger one (see the definition of CSSIDR).
> I think for "excessive" cache line sizes it is a good idea to balance
> between the positive performance effect of having a single entry
> per cache line and the amount of wasted space on the shared
> ring. With that I think 64 is a reasonable compromise, which had
> been agreed to also in earlier discussions on other interfaces (e.g.
> the blkif indirect descriptor extension iirc).
Sounds good, will use 64
> Jan

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