[Bug 88716] [HSW GT1] trying to flip between 2 buffers of different strides

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=88716

--- Comment #5 from Chris Wilson <chris at chris-wilson.co.uk> ---
(In reply to dhead666 from comment #4)
> * 1st test: xf86-video-intel-2.99.916 with flag --enable-debug=full
> It looks like adding the flag created another issue, X on vt1 crashing when
> I change to vt2.
> This test is just to show the X is crashing.
> logs:
> 20150123-01-xorg_fast_crash-journal.log
> 20150123-01-xorg_fast_crash-Xorg.0.log.log (7MB on Dropbox)

There's a broken DBG there in 2.99.916.

> * 2nd test: xf86-video-intel-2.99.916 with flag --enable-debug=full
> In this test I opened multiple tabs in Chromium with allot of images that I
> hope overloaded the GPU and generated the wanted debug info.
> logs:
> 20150123-02-gpu_slowdown-journal.log
> 20150123-02-gpu_slowdown-Xorg.3.log.log (100MB)

Hmm. We never did a forced crtc flip (i.e. all the front/back pitches were the
same). I am not sure if you managed to reproduce the slowdown exactly. My guess
is that you need fullscreen chromium?


> * 3rd test: xf86-video-intel-2.99.916 with flag --enable-debug=full and with
> patch 0001-sna-dri2-Only-preserve-back-buffers-with-the-same-pi.patch
> Same as 2nd test but with the patch added.
> 20150123-03_with_patch-gpu_slowdown-journal.log
> 20150123-03_with_patch-gpu_slowdown-Xorg.0.log.log (50MB)

All front/back pitches were equal. Again there was no forced crtc flips.

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