Re: [Xen-devel] [RFC] PVFB: Add refresh period to XenStore parameters?

[Samuel Thibault <samuel.thibault@xxxxxxxxxxxxx>]

Markus Armbruster, le Tue 04 Mar 2008 18:06:26 +0100, a écrit :
> Samuel Thibault <samuel.thibault@xxxxxxxxxxxxx> writes:
> > Markus Armbruster, le Tue 04 Mar 2008 16:48:20 +0100, a écrit :
> >> * The domU writes to a framebuffer provided by the frontend.
> >>
> >> * The framebuffer (not a copy of it) can be shared with the backend,
> >>   which only reads.
> >
> > Well, that's not always the case, when the guest is in text mode for
> > instance, the PV shared buffer is converted from the guest text buffer.
> 
> Optimize for the common case.  Which I figure is a 32 bpp framebuffer.

Cirrus VGA is 24bpp max :)

> Anyway, compare and copy for some legacy 80x25 text mode shouldn't eat
> that much CPU.

Yes.

By my "that's not always the case", I actually expressed the need for
the offset feature.

Samuel

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