On 25/09/10 12:49, Bert Freudenberg wrote:
> On 25.09.2010, at 01:42, Levente Uzonyi wrote:
>
>> On Fri, 24 Sep 2010, Alexander Lazarević wrote:
>>
>>> Just curious ...
>>>
>>> On Ubuntu I get a merely 25 fps doing the OpenGL example. If I move
>>> the mouse it starts to get faster and reaches about 60 fps. Why? Now
>>> on Windows7 running inside VirtualBox(!) on the very same hardware I
>>> get up to 400 fps and there is no influence by moving the mouse. Are
>>> there some magic buttons I have to press before using OpenGL on
>>> Linux/Ubuntu?
>> I guess it's a driver issue. I'm sure there are OpenGL benchmarks written in C out there, so you can easily check this.
> I've seen the "need to move mouse to cause anything to happen" issue even without using OpenGL. We never really figured that one out. It's not easily reproducible across systems.
>
> There also was a possibly related problem in that our squeaksource server would freeze, and wiggling the mouse would get it unstuck.
>
> - Bert -

A hunch for Linux: interrupts from mouse/ mouse-driver trigger early 
return of system calls (with errors EINTR/EAGAIN) and the surrounding 
code simply fails silently rather than do an immediate retry. IIRC 
*any/all* sys calls can be interrupted in this way.

-D