[Bug 91617] [BDW] Incorrect rendering in CS:GO

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91617

--- Comment #13 from Matthieu Bouron <matthieu.bouron at gmail.com> ---
(In reply to Eero Tamminen from comment #12)
> Could you run Steam from terminal and start the game & report whether there
> are e.g. any Mesa shader compiler errors?

It looks like there is not mesa compiler error, according to
http://pastie.org/private/tx8oids2l8zzw5dafthbcg.

> 
> (In reply to Matthieu Bouron from comment #2)
> > I also experience better framerates with the ivy bridge setup (Intel(R)
> > Core(TM) i7-3520M CPU @ 2.90GHz). At the same resolution, using the same
> > video settings on the following benchmark test
> > http://steamcommunity.com/sharedfiles/filedetails/?id=500334237:
> >   * the ivy bridge setup gives 42fps average.
> 
> 16 EUs @ 1250 Mhz
> 
> >   * the broadwell setup gives 31fps average.
> 
> 24 EUs @ 950 Mhz  -> More ALU power
> 
> 
> > The same performance difference appears running glxgears fullscreen (same
> > resolution) with vblank_mode=0
> >
> > There is not trace of cpu throttling in dmesg during the tests.
> > The gpu frequency seems to be stuck at 950mhz during the test most of the
> > time. It varies from time to time to 900mhz
> > (using the intel_gpu_frequency tool).
> 
> I think that just tells (or sets) kernel GPU frequency requests, it doesn't
> report at what speed GPU is actually run (tgat can be limited by firmware
> due to TDP or temperature).
> 
> You need to poll actual GPU frequency, e.g. like this (as root):
>   while true; do cat /sys/class/drm/card0/gt_act_freq_mhz; sleep 1; done
> 

It stays at 950mhz most of the time, sometimes going to 900mhz, even through
the framerate is erractic, constantly going from 60+ to 15fps while looking at
the same place.

> If your GPU freq doesn't get TDP limited [1], you either have slower memory
> in BDW, or you use only one memory channel.  Check "sudo dmidecode" output,
> it will tell in which channels your memory is and what is its speed.
> 
> [1] Your BDW seems to have 15W limit (while your IVB has 35W limit):
> http://ark.intel.com/products/85215/Intel-Core-i7-5600U-Processor-4M-Cache-
> up-to-3_20-GHz

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