X-Server 1.5.0 very sluggish

Michel Dänzer michel at tungstengraphics.com
Mon Sep 15 09:58:36 PDT 2008

On Mon, 2008-09-15 at 12:31 -0400, Owen Taylor wrote:
> I don't have any immediate ideas, but I wanted to throw in the data
> point that I also seem to see a sudden slowness on r300+EXA moving from
> 1.4.99 snapshot from July 2 (current F9 packages) to 1.5.0. Somewhat
> similar to what you describe, though not nearly as extreme. (Some
> windows take a couple of seconds to repaint, but menus are normal.) 
> This is leaving the radeon driver, mesa, etc, unchanged, and only
> upgrading the X server.
> The slowness seems to be triggered by rendering UI elements in the GTK+
> theme I'm using (Clearlooks, AFAIK) ... so it would be some sort of
> problem with Render acceleration of gradients, masks, or similar. 
> Looking at sysprof output, most of the time during sluggish redrawing
> is spent migrating pixmaps from video memory into system memory inside a
> Composite operation, so it appears that for some reason, software
> fallbacks are being triggered. The sysprof output, unfortunately doesn't
> have enough detail to be able to tell why that is happening.

Can one of you guys bisect this regression?

Earthling Michel Dänzer           |          http://tungstengraphics.com
Libre software enthusiast         |          Debian, X and DRI developer

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