retitle 245548 xserver-xfree86: backing store implementation is very slow tag 245548 + upstream thanks On Fri, Apr 23, 2004 at 08:32:13PM +0200, julien pommier wrote: > Package: xserver-xfree86 > Version: 4.3.0-7 > Severity: minor > > I'm not sure if this is the right place to report this kind of "bug", but I > just noticed that using Option "BackingStore" "on" in XF86Config does affect > tremendously the performance in certain conditions. I'm using the "radeon" > driver, I don't know if this is specific to this driver. When I run the > following source code: [...] > Maybe there is a logical explanation to this, but I really don't understand: > backingstore is supposed to speed the refresh, not slow it ! And it should not > be involved in that case since the windows here use SaveUnder, and mozilla does > not use BackingStore. I'm quite puzzled. I've heard people who understand X server internals refer to the existing backing store implementation as something resembling garbage. Keith Packard's X server work for freedesktop.org is expected to make a vastly improved backing store implementation available. As I understand it, the DAMAGE and XFIXES extensions have much to do with this. Other folks on the debian-x mailing list (who will see these messages) may be willing to add more information. Mine is mostly second-hand. -- G. Branden Robinson | Debian GNU/Linux | Ab abusu ad usum non valet branden@debian.org | consequentia. http://people.debian.org/~branden/ |
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