Question about KDE 4.2

[David C. Manuelda]

El Friday 09 January 2009 00:45:08 Kishore escribió:
> On Thursday 08 Jan 2009 12:52:13 pm Kishore wrote:
> > On Thursday 08 Jan 2009 12:26:45 am Anne Wilson wrote:
> > > On Wednesday 07 January 2009 12:51:17 Kishore wrote:
> > > > On Wednesday 07 Jan 2009 5:11:57 pm David Carlos Manuelda wrote:
> > > > > Thanks for the explanation, this answers half of my question but
> > > > > there are still a few problems which I don't really know where they
> > > > > come from. Whe having drawing related issues I understand what is
> > > > > the cause but for example, the delay when you click K menu until it
> > > > > is drawn (until, not while) for 1 or 2 secs + the delay when you
> > > > > click exit until the "logout window" comes up, another 2 secs + the
> > > > > delay when you click some option (reboot, logout, shutdown) until
> > > > > it is proccessed, another 2 secs. I can messure this because I have
> > > > > the clock plasmoid in taskbar configured to show seconds, and in
> > > > > that operations, that clock freezes not updating seconds, so I
> > > > > assume something in kdelibs (or in plasma itself) is doing a heavy
> > > > > work. I can not explain it better, I hope it can be understood.
> > > > > I confirmed that it does not only happen to me in my system or with
> > > > > my nvidia card, and I've been reading lots of stuff in internet of
> > > > > people having this issue too so maybe the problem is kdelibs for
> > > > > KDE4 are not still optimized (just my idea), and thus, I asked in
> > > > > my first post.
> > > >
> > > > When you are faced with this "slowness" is there also a heavy disk
> > > > I/O?
> > > >
> > > > I have a similar issue here where it sometimes takes up few seconds
> > > > for a seemingly trivial task. like opening the kmenu or clock
> > > > settings or ... But this seems to be also related to another bug
> > > > (atleast in [K]Ubuntu) where the system really becomes painfully slow
> > > > when there is concurrent disk I/O.
> > >
> > > Those are the symptoms I was seeing, as well as system freezes.  They
> > > appear to have been cured by changing the AccelMethod to EXA (in
> > > xorg.conf).
> > >
> > > > There is not much processor load during these times but "system
> > > > activity" reports several "disk sleeps".
> > >
> > > I haven't seen that particular report.
> >
> > I have not really gotten around to figuring out the real problem here
> > yet. I see the above mentioned issue on only one of the machines that I
> > use so it does seem hardware dependent. Ill try and explore more...
>
> I really don't know how to explain this... based on what I read here, I
> decided to update my nvidia driver from 177 to 180 which was also available
> in the intrepid repos. I then restarted and noticed big difference! I
> mean.. i had smooth graphics before too but now I don't seem to have the
> issue of slow disk i/o slowing down the entire system. Laptop runs cooler
> and I can barely hear the fan anymore!
>
> I would never have expected the graphics driver to cause those seemingly
> unrelated issues! The only way I can possibly explain this is that the
> previous driver (177) was really screwing up the IRQ's by possibly causing
> too many interrupts and taking too long to process them... maybe also
> changing the IRQ priority. This caused slow disk I/O and staggered mouse
> movement as those events also possibly generate frequent IRQ's.
>
> Well! I don't know what the real cause was but I am now a happy user!
> Thank you all for pushing me in this direction! :)

I am glad I could help another too with my experiencies and questions :)

But I have to advise you: beware, since you can have severous stability issues 
(depending on your hardware, and much other things).

I am reporting to NVIDIA a corruption of graphics I have while running 180.22 
(latest "stable" (which is not that stable for me)), so maybe we need to wait 
a little bit more :)
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