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List:       freenx-knx
Subject:    Re: [FreeNX-kNX] Cannot load long webpage in NX
From:       "Fabian Franz" <FabianFranz () gmx ! de>
Date:       2007-03-28 1:57:31
Message-ID: 20070328015731.90060 () gmx ! net
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> exactly, Xorg/Xfree eats up the free memory and X crashes

Yes.

> 
> > > Disabling backing store on client might help with not image-related
> > > memory usage.
> 
> it does NOT help with this problem, it does nothing at all at the client
> side 
> (put as an option to Xorg)

Hm, okay.

> As far as I researched I found (I think) that the core of the problem is
> an 
> built in extension in Xorg that is called MIT-SHM which cashes 
> images/graphics in memory which is used by Xorg to recall recently opened 
> images from memory in opposite to redraw them again. 

That is different from my understanding that with MIT-SHM appication draw directly \
into a shared pixmap buffer.

But if that one is in the X-Server it might be that this causes the problems.

> I couldn't find a way
> to 
> disable it 

-noshmem might work, though I don't know.

> Does anyone have an idea how to disable this "feature" in Xorg? 

What (tested) does work however is:

-extension "MIT-SHM"

You can test it with xdpyinfo, which lists all the extensions.

> In my case memory is more important (in financial view) than a little 
> performance issue.

Sure.

Hadn't thought about it that shared memories could be _that_ way when using remote X.

So, please report back and if it works, add it to the FAQ.

cu

Fabian
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