From: Tristan Gingold <Tristan.Gingold@bull.net>
To: linux-ia64@vger.kernel.org
Subject: Re: [Xen-ia64-devel] Re: ia64 kexec: xen -> linux
Date: Thu, 28 Sep 2006 06:55:22 +0000 [thread overview]
Message-ID: <200609280855.22061.Tristan.Gingold@bull.net> (raw)
In-Reply-To: <200609271152.12393.Tristan.Gingold@bull.net>
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.
next prev parent reply other threads:[~2006-09-28 6:55 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-09-27 9:52 [Xen-ia64-devel] Re: ia64 kexec: xen -> linux Tristan Gingold
2006-09-28 1:27 ` Horms
2006-09-28 6:55 ` Tristan Gingold [this message]
2006-09-28 7:00 ` Horms
2006-09-28 12:33 ` Magnus Damm
2006-09-28 12:34 ` Magnus Damm
2006-09-28 12:47 ` Tristan Gingold
2006-09-29 2:21 ` Zou, Nanhai
2006-09-29 3:03 ` Horms
2006-09-29 3:48 ` Horms
2006-09-29 5:13 ` Zou, Nanhai
2006-09-29 5:37 ` Horms
2006-10-05 2:53 ` Horms
2006-10-05 16:52 ` Bjorn Helgaas
2006-10-06 1:44 ` Horms
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