xorg Digest, Vol 123, Issue 4

[Gary Smith]

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On 3 October 2015 at 20:00, <xorg-request at lists.x.org> wrote:

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>    1. Re: Dual 4K slowness due to xorg threading concept?
>       (Thomas Wunder)
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> ----------------------------------------------------------------------
>
> Message: 1
> Date: Sat, 03 Oct 2015 12:06:47 +0200
> From: Thomas Wunder <foren at thomas-wunder.de>
> To: xorg at lists.x.org, thomas.luebking at gmail.com
> Subject: Re: Dual 4K slowness due to xorg threading concept?
> Message-ID: <1897081.Xq4AIt4pgz at i7wstom>
> Content-Type: text/plain; charset="iso-8859-1"
>
> On Freitag, 2. Oktober 2015 07:23:57 PDT, Thomas Lübking wrote:
> > On Freitag, 2. Oktober 2015 12:59:30 CEST, Christopher Barry wrote:
> > >> Problem:
> > >> "Graphics stuff" seems to work smoothly on lower resolutions (e.g. 2x
> > >> 2560x1600). On high resolution (2x 3840x2160) still everything
> > >> (moving/resizing windows, playing videos, scrolling through lists,
> > >> text views or consoles, opening menus) goes smoothly but only as long
> > >> as single windows are really small (and as long as there are not too
> > >> many of them). As soon as a window becomes half the size of a screen
> > >> or even full screen, operations mentioned before become horribly slow
> > >> (K-Menu takes up to 8 secs to even open up) and CPU usage of the Xorg
> > >> process is vastly increasing (to about 100%). I don't really have an
> > >> idea of what's going wrong here. There are no apparent errors etc.
> > >> The only thing that seems really suspect to me is the 100% CPU which I
> > >> would attribute to a (multi-)threading issue... I'd really appreciate
> > >> if you could give me a hand and point me to the right direction to get
> > >> things working.
> >
> > You're likely running into texture/shader limitations and fallover to
> some
> > software emulation - the GPU is indeed not fully suited for such
> > resolutions.
> >
> > => suspend the compositor (SHIFT+Alt+F12, no shadows, no translucency) or
> > use the XRender backend (kcmshell[4] kwincompositing") *Maybe* even
> > disabling the blur filter and setting the scale method to anything but
> > "accurate" (ie. try smooth) might aid.
> >
> > Cheers,
> > Thomas
> Hello Thomas,
> thanks for your reply (which I haven't received through the mailing list
> for
> some reason but found it on the archive site). Your advice of switching
> from
> OpenGL to XRender did the trick. Now things are running much smoother than
> before. For the long run I think I would go for a more powerful GPU just as
> Christopher suggested.
>
> Thanks a million!
>  Thomas
>
>
>
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> End of xorg Digest, Vol 123, Issue 4
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-- 
Gary Smith
gary8smith at gmail.com
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