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

from [Tristan Gingold] [Permanent Link][Original]
To: Horms <horms@xxxxxxxxxxxx>
Subject: Re: [Xen-ia64-devel] Re: ia64 kexec: xen -> linux
From: Tristan Gingold <Tristan.Gingold@xxxxxxxx>
Date: Thu, 28 Sep 2006 08:55:22 +0200
Cc: Linux-IA64 <linux-ia64@xxxxxxxxxxxxxxx>, "Zou, Nanhai" <nanhai.zou@xxxxxxxxx>, xen-ia64-devel@xxxxxxxxxxxxxxxxxxx
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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.

Tristan.


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