code bloat [was Re: Semaphore assembly-code bug]
Adam Jackson
ajax at nwnk.net
Mon Nov 1 09:00:25 PST 2004
On Monday 01 November 2004 10:35, Roland Mainz wrote:
> Lee Revell wrote:
> > Um I don't think chucking X is the answer. The problem is that it's
> > embarassingly slow compared to any modern GUI. If the display were as
> > snappy as WinXP I don't care if it's 200MB. On my desktop I constantly
> > see windows redrawing every freaking widget in situations where XP would
> > just blit from an offscreen buffer or something.
>
> That sounds more like that backing-store is turned off in your
> Xserver... ;-/
Backing store and XAA are mutually exclusive. If you do an XAA-accelerated
operation to a region with a backing store, then you invalidate the backing
store. Woops.
XAA goes to a lot of effort to accelerate the primitives no one uses, and
desperately needs to be taken out behind the barn and shot. KAA accelerates
probably a tenth of the ops XAA accelerates, but they're the right tenth so
the code is simpler and the performance way better.
So, yeah, chucking X is not the answer, but chucking XAA probably is.
- ajax
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