Le Jeudi 28 Septembre 2006 14:34, Magnus Damm a écrit : > 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? According to linux/arch/ia64/kernel/efi.c, the code to switch efi to virtual mode was added later. I don't know why this was added. Maybe the answer is in the web? Tristan. - To unsubscribe from this list: send the line "unsubscribe linux-ia64" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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