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List:       kde
Subject:    Re: [kde] Question about KDE 4.2
From:       Anne Wilson <cannewilson () googlemail ! com>
Date:       2009-01-06 20:23:56
Message-ID: 200901062023.57125.cannewilson () googlemail ! com
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On Tuesday 06 January 2009 17:44:14 Kishore wrote:
> On Tuesday 06 Jan 2009 10:38:51 pm David Carlos Manuelda wrote:
> > On Monday 05 January 2009 19:23:39 Nikos Chantziaras wrote:
> > > Rex Dieter wrote:
> > > > David Carlos Manuelda wrote:
> > > >> For example, since I click the K button to raise menu until the menu
> > > >> is raised, it is a second or two. The same when running dolphin and
> > > >> clicking in folders for example. I don't note this too much while
> > > >> running them inside a 3.5.10.
> > > >
> > > > I've never seen such operations take more than an instant, regardless
> > > > of which DE is in use.
> > > >
> > > > I would venture there's a different explanation other than the
> > > > general "kde4 is slower".
> > >
> > > This happens if compositing is enabled and a binary-only, proprietary
> > > NVidia or ATI driver is used or if EXA acceleration is not enabled (in
> > > the case of open source drivers; the proprietary ones don't support
> > > EXA.)
> > >
> >
> > I had compositing disabled, yet using the binary drivers from nvidia so
> > maybe is EXA related, but is strange, as I said, this does not happens
> > while running 3.5.10. That's why I asked, because with same X config I
> > note the impact of performance running the whole kde 4.1.3 over running
> > same apps inside 3.5.10.
> > Then, I'll try to set up my X using the VESA driver and retry.
>
> As it seems... it does matter. Apparently, KDE4 tends to take full
> advantage of some underlying features which were barely used before. This
> supposedly has exposed new bugs in the underlying stuff. This likely does
> not answer your specific question but was just to give you an idea.

In fact NVidia had to release a new driver for just that reason.  KDE4 was 
using features that had been in the driver for quite a while, but were never 
used.  KDE4 exposed a major weakness that cause unbearably slow performance 
with some NVidia cards.  NVidia acknowledged the problem and tackled it.  I 
suspect we are going to be reaping this sort of problem for a while, until all 
the vendors have come to terms with the new requirements.

The good news, though, is that Nikos' solution does seem to be working for me.

Anne

Anne

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