Great slowness with radeon(4x) and AccelMethod "EXA" for X.Org 7.2

Chris Rankin rankincj at
Sat Jun 16 03:19:41 PDT 2007

On Fri, 2007-06-01 at 00:56 +0200, Jeremie Le Hen wrote:
> A friend of mine (Cc:'ed), who has the very same laptop as me,
> investigated the problem a little further, and it appeared that the
> line is the guilty:
> 	Option         "AccelMethod"   "EXA"

On Fri Jun 1 00:10:32 PDT 2007, Michel Dänzer wrote:
> EXA performance was improved significantly in xserver 1.3.

Actually, my Xorg experience upgrading from FC6 to FC7 is exactly the same as Jeremie's. I even
raised this Fedora bug about it:

> In the meantime, Option "MigrationHeuristic" "greedy" might provide similar performance as with
> 6.9.

Interesting - I shall try this.

> In general though, EXA is only expected to give a benefit when using a compositing manager.

I tried using XOrg 7.2 with a compositing manager and EXA, and the result was so slow as to be
unusable. So now I am back to using XAA.

Isn't XAA the "old" acceleration architecture that EXA is supposed to replace, though? 


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