Re: [Xen-devel] [PATCH] Std VGA Performance

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 29/10/07 18:48, "Alex Williamson" <alex.williamson@xxxxxx> wrote:

> On Wed, 2007-10-24 at 17:36 -0400, Ben Guthro wrote:
>> This patch improves the performance of Standard VGA,
>> the mode used during Windows boot and by the Linux
>> splash screen.
> 
> Hi,
> 
>    ia64 uses VGA too.  I've been able to regain some functionality with
> the patch below, but the VGA modes used by our firmware still have
> significant issues (once we boot to Linux userspace, VGA text mode gets
> readable).  It seems like perhaps we've lost support for some basic text
> VGA modes.  I haven't tried to understand the changes in qemu yet, but
> are we sacrificing compatibility for performance?  Patch and screen shot
> below.  Thanks,

All that's changed for ia64 is the definition of the buffered ioreq
structure, which has become more densely packed. All the rest of the
acceleration is (currently) x86-specific. So this shouldn't be too hard to
track down...

 -- Keir



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