Re: [Xen-devel] [PATCH v3 1/5] xen: introduce two different max_nr_dom0/domU_grant_frames parameters

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

On Wed, 8 Oct 2014, David Vrabel wrote:
> On 08/10/14 17:01, Stefano Stabellini wrote:
> > On Wed, 8 Oct 2014, David Vrabel wrote:
> >> On 08/10/14 14:00, Stefano Stabellini wrote:
> >>> Remove max_nr_grant_frames, both variable and preprocessor symbol.
> >>> Introduce two global variables max_nr_dom0_grant_frames and
> >>> max_nr_domU_grant_frames, separately configurable via the Xen command line
> >>> option "gnttab_max_nr_frames".
> >>
> >> Why?  I can't think of a sensible use case for this and you don't list
> >> one.  dom0 doesn't really use grants so its current number grant frames
> >> is usually 1 so it doesn't seem useful to restrict it differently.
> > 
> > See the recent discussion with Jan:
> > 
> > http://marc.info/?l=xen-devel&m=141260825209210
> 
> I still don't see a use case.  Either:
> 
> a) dom0 is the driver domain and doesn't need a large number of grants.
> 
> or
> 
> b) dom0 has a frontend driver, then the driver domain will have to scan
> dom0's grant table thus dom0's grant table must be sized the same as domUs.

I don't have an opinion on this, so I'll leave it up to you and Jan to
come to an agreement.

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