Re: [Xen-ia64-devel] Re: ia64 kexec: xen -> linux

["Magnus Damm" <magnus.damm@xxxxxxxxx>]

On 9/28/06, Tristan Gingold <Tristan.Gingold@xxxxxxxx> wrote:
> Le Jeudi 28 Septembre 2006 03:27, Horms a écrit :
> > On Wed, Sep 27, 2006 at 11:52:12AM +0200, Tristan Gingold wrote:
> > > Linux and xen call efi in real mode if set_virtual_address_map fails.
> > > You may add an option in both xen and linux to force calling efi in real
> > > mode. This should be really simple and you will be able to make progress.
> >
> > Great, I will test this out and see how it goes.
> >
> > > The only possible drawback is performance.
> >
> > What kind of performance issues would you expect?
> Making EFI calls in physical mode is slower: Linux must switch from and to
> virtual mode.
>
> However EFI calls are very unfrequent so the impact should be almost nul.
This makes me wonder - is it really worth having two code paths in that case?

/ magnus

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