Re: [gnome-flashback] Main menu 10 times slower in Ubuntu 12.04 vs 10.04

[Alkis Georgopoulos <alkisg gmail com>]

Στις 23/01/2014 12:10 μμ, ο/η Jo-Erlend Schinstad έγραψε:
> No, it really doesn't prove anything at all. In Ubuntu 10.04, we used
> the Compiz 0.8-series, I believe. That was certainly _much_ faster on
> some systems than 0.9 has been, at least until recently. Things like
> that can play a big role. Have you tried using Metacity in 12.04 to see
> if that makes a difference?

We've never used Compiz, we've only been using gnome-panel with 
Metacity, from Ubuntu 7.04 to 14.04, in about 500 schools here.

> In any case, I'm not able to confirm this on any of my systems.

Gnome-panel is very visibly slow in Ubuntu 12.04 on P4 @1.7, 2.0, 2.4, 
2.8 GHz.
Those all have 256 or 512 KB L2 cache.
It's not much visible on P4 @3.0 nor on P4 M (centrino) @1.4 GHz.
Those two have 1024 KB L2 cache.
I don't know if the L2 cache size matters at all, but if you're trying 
to reproduce it, it might help selecting a processor with <= 512 KB L2 
cache.

In my work I have access to a big variety of old hardware, so if you'd 
like specific tests for specific hardware that would help in 
troubleshooting this, I'm willing to provide them.
But I believe that a test application that would measure how much time 
is needed to "draw a menu item 1000 times" would make testing much 
easier, it would reveal how much slower the menu is in recent versions 
compared to past ones, without having to use old hardware and videos to 
prove that it's slower.

I'd like to point out again that it's just the main menu that is 10 
times slower in recent versions, not other parts of the system or other 
applications, so I'm inclined to believe that the regression is in some 
part of the gnome-panel code or in some specific gtk functions that 
aren't used much in other applications.

Kind regards,
Alkis