[Bug 77712] SNA performance regression from 3.13.7 to 3.14 kernel

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=77712

--- Comment #8 from Chris Wilson <chris at chris-wilson.co.uk> ---
(In reply to comment #5)
> 3.15rc2 from bug76554 branch regressed even more
> GtkPerf 0.40 - Starting testing: Wed Apr 23 16:18:54 2014
> 
> GtkEntry - time:  0.03
> GtkComboBox - time:  0.46
> GtkComboBoxEntry - time:  0.36
> GtkSpinButton - time:  0.04
> GtkProgressBar - time:  0.02
> GtkToggleButton - time:  0.03
> GtkCheckButton - time:  0.03
> GtkRadioButton - time:  0.04
> GtkTextView - Add text - time:  0.20
> GtkTextView - Scroll - time:  0.09
> GtkDrawingArea - Lines - time:  0.38
> GtkDrawingArea - Circles - time:  0.27
> GtkDrawingArea - Text - time:  0.12
> GtkDrawingArea - Pixbufs - time:  0.01
>  --- 
> Total time:  2.09
> 
> Lines and Circles regressed hard.

Yes. That's due to the new idiotic cmd parser. You have to disable it in order
to get comparable results. :|

(In reply to comment #6)
> That was printed in VT1 before welcome message:
>
> 2014-04-23T16:35:55.660575+04:00 linux-2uju kernel: [    0.000000] Linux
> version 3.14.0-6.ga68bc7c-desktop+ (absorbb at linux-2uju) (gcc version 4.8.1
> 20130909 [gcc-4_8-branch revision 202388] (SUSE Linux) ) #1 SMP PREEMPT Tue
> Apr 22 17:11:42 MSK 2014
> ...
> 2014-04-23T16:35:55.661500+04:00 linux-2uju kernel: [    0.386481] Ring
> render ring before initialisation: 00000000 00000000 00000000 00000000
> 2014-04-23T16:35:55.661501+04:00 linux-2uju kernel: [    0.388218] Ring
> render ring after initialisation: 0001f001 00000008 00000008 009f1000
> 2014-04-23T16:35:55.661502+04:00 linux-2uju kernel: [    0.388270] Ring bsd
> ring before initialisation: 00000000 00000000 00000000 00000000
> 2014-04-23T16:35:55.661503+04:00 linux-2uju kernel: [    0.388283] Ring bsd
> ring after initialisation: 0001f001 00000008 00000008 00a13000
> 2014-04-23T16:35:55.661505+04:00 linux-2uju kernel: [    0.388307] Ring
> blitter ring before initialisation: 00000000 00000000 00000000 00000000
> 2014-04-23T16:35:55.661506+04:00 linux-2uju kernel: [    0.388320] Ring
> blitter ring after initialisation: 0001f001 00000008 00000008 00a34000
> 2014-04-23T16:35:55.661631+04:00 linux-2uju kernel: [    0.503503]
> [drm:cpt_serr_int_handler] *ERROR* PCH transcoder A FIFO underrun
> 
> Is this ok?

The ring messages are just debug for another issue. The fifo underrun shouldn't
happen either, but doesn't affect things either.

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