<html> <head> <base href="https://bugs.freedesktop.org/" /> </head> <body> <div> <a class="bz_bug_link bz_status_NEEDINFO " title="NEEDINFO --- - KDE Konsole very slow scrolling with TearFree and QT graphics system native" href="https://bugs.freedesktop.org/show_bug.cgi?id=77436#c77">Comment # 77</a> on <a class="bz_bug_link bz_status_NEEDINFO " title="NEEDINFO --- - KDE Konsole very slow scrolling with TearFree and QT graphics system native" href="https://bugs.freedesktop.org/show_bug.cgi?id=77436">bug 77436</a> from <a class="email" href="mailto:chris@chris-wilson.co.uk" title="Chris Wilson <chris@chris-wilson.co.uk>"> Chris Wilson</a> <pre>I pushed a variant as commit 1beaa980ea6a9617f7dd4dc87b881c37cc7a277b Author: Chris Wilson <<a href="mailto:chris@chris-wilson.co.uk">chris@chris-wilson.co.uk</a>> Date: Wed Jun 11 16:41:22 2014 +0100 sna/gen6+: On small GT avoid the intermediate copy for overlaps If the memory bw is constrained on the GPU avoid doing the 2-pass copy for overlaps on the render ring, and do the single pass slower BLT copy instead - as since it has to transfer less data it will be faster. Reported-by: Ildar Nurislamov <<a href="mailto:absorbb@gmail.com">absorbb@gmail.com</a>> Bugzilla: <a class="bz_bug_link bz_status_NEEDINFO " title="NEEDINFO --- - KDE Konsole very slow scrolling with TearFree and QT graphics system native" href="show_bug.cgi?id=77436">https://bugs.freedesktop.org/show_bug.cgi?id=77436</a> Signed-off-by: Chris Wilson <<a href="mailto:chris@chris-wilson.co.uk">chris@chris-wilson.co.uk</a>> If that makes scrolling fluid, great. I'd like to dig more into why it slowed down so much though. My guess is due to cache thrashing on the GPU and memory bandwidth, but I don't feel that adequately explains how far behind the GPU got in the command stream, nor how it interacted with a loaded system.</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the QA Contact for the bug.</li> </ul> </body> </html>