KDE's use of video memory?
James Richard Tyrer
tyrerj at acm.org
Sun Sep 28 19:28:00 BST 2003
Steve Snyder wrote:
> Does the amount of video memory installed on a system affect KDE's
> performance and/or capabilities?
It affects the performance of X, which has only a small effect on KDE's
> I have a new notebook system that has no dedicated video memory but
> instead uses a portion of system memory. The amount of system memory
> reserved for video use is configurable in the BIOS and currently set to
> 64MB. I'm trying to get some sense of how much "video memory" I really
> need and how much is going unused.
First, you need to know how much memory is needed for the screen. The rule
of thumb is the screen width x 4. Use 4 rather than 3 because some cards
have limitations on how they can access video memory.
> The only reason I can think of to have lots of video memory is to contain
> the textures for 3D games. As the 3D performance of this hardware
> (Radeon IGP 340M, with no DRM support) is so poor, though, I won't be
> running anything like that.
Yes to some extent.
> I'm thinking of reducing my "video memory" from it's current 64MB to 32MB,
> or maybe even 16MB. This would provide more memory to the overall
> system, which I know would be used, even if only for disk caching.
> However, I don't want to starve KDE of resources that it really will use.
> My desktop is running at 1024x768x32bpp.
> So... how much video memory will KDE v3.1 (with XFree86 v4.3.0) really use
> when running in a 2D mode? Is there any way to measure it?
So, IMO if you are using only office type applications you could get by
with 4MB of video (that is all I have till I get a better video card) but
8MB might give you better performance. Anything more than that is a waste
for 2D applications.
You can try 3MB or 6MB, but that would be experimental.
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