[Nouveau] [Bug 33977] X core font rendering is "laggy"

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=33977

--- Comment #7 from Michel Dänzer <michel at daenzer.net> 2011-02-09 01:32:04 PST ---
(In reply to comment #6)
> The "gaps in text" problem at high throughput isn't fixed by adding a flush in
> the driver, for that the original solution is still needed. Even flushing every
> 10 ms isn't enough to get the same result.

I'm still not 100% convinced this problem is severe enough to justify the
throughput penalty of the patch though... Since the radeon driver recently
switched to always using DownloadFrom/UploadToScreen to access tiled GPU
pixmaps, I've been looking for it but haven't really noticed it yet (my xserver
checkout doesn't have your patch yet).


> The latency issues at low throughput (typing for example) is pretty much solved
> with an extra driver flush after small uploads to the screen pixmap.

Not sure why you'd need any 'extra flushes' besides the flush in your
BlockHandler, which has always been necessary. Just make sure this flush
happens after ExaBlockHandler (i.e. after calling down the wrapper chain).

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