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Re: [Xen-ia64-devel] Re: ia64 kexec: xen -> linux
| To: | "Tristan Gingold" <Tristan.Gingold@xxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-ia64-devel] Re: ia64 kexec: xen -> linux |
| From: | "Magnus Damm" <magnus.damm@xxxxxxxxx> |
| Date: | Thu, 28 Sep 2006 21:34:20 +0900 |
| Cc: | "Zou, Nanhai" <nanhai.zou@xxxxxxxxx>, Horms <horms@xxxxxxxxxxxx>, Linux-IA64 <linux-ia64@xxxxxxxxxxxxxxx>, xen-ia64-devel@xxxxxxxxxxxxxxxxxxx |
| Delivery-date: | Thu, 28 Sep 2006 05:34:31 -0700 |
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| References: | <20060915092521.GA27714@xxxxxxxxxxxx> <200609271152.12393.Tristan.Gingold@xxxxxxxx> <20060928012731.GA13465@xxxxxxxxxxxx> <200609280855.22061.Tristan.Gingold@xxxxxxxx> |
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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 _______________________________________________ Xen-ia64-devel mailing list Xen-ia64-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-ia64-devel |
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