[Qemu-devel] Re: Extremely slow graphic updates

[Stefano Stabellini <stefano.stabellini@eu.citrix.com>]

Stefano Stabellini wrote:

> Paul Brook wrote:
> 
>>> 'ssh -X fastserver' and running qemu there.  With the new display code
>>> this has made qemu very slow and hardly useable.
>> I'm seeing similar extreme slowness even on a local machine.
>>
>> Particularly noticeable is that the monitor displayed on a qemu virtual SDL 
>> console (i.e. the defaut) slow enough to be practically unusable. It's taking 
>> the best part of a second to rendering a character.
>>
>> This is on an otherwise fast machine that does not have accelerated X drivers, 
>> which suggests we're doing something really dumb like reading from video ram.
> 
> We are not doing anything that dumb (anything that I am aware of :)
> 
>> I have confirmed that this is caused by r6336.
>>
> 
> What is the quickest way for me to reproduce this problem?
> Have you seen this on ppc emulation only?
> 
> I gather that the guest is in text mode. Have you seen this in graphical
> mode too? If yes, what was the resolution of the guest?
> 
> What is the resolution of your host? What X11 extensions are you using?
> Do you set SDL_VIDEODRIVER anywhere?
> 
> Sorry for the list of questions, I am just trying to better understand
> the issue.
> 
> 


And most important: are you sure it is an SDL only problem?