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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - [BDW] Incorrect rendering in CS:GO"
href="https://bugs.freedesktop.org/show_bug.cgi?id=91617#c13">Comment # 13</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - [BDW] Incorrect rendering in CS:GO"
href="https://bugs.freedesktop.org/show_bug.cgi?id=91617">bug 91617</a>
from <span class="vcard"><a class="email" href="mailto:matthieu.bouron@gmail.com" title="Matthieu Bouron <matthieu.bouron@gmail.com>"> <span class="fn">Matthieu Bouron</span></a>
</span></b>
<pre>(In reply to Eero Tamminen from <a href="show_bug.cgi?id=91617#c12">comment #12</a>)
<span class="quote">> Could you run Steam from terminal and start the game & report whether there
> are e.g. any Mesa shader compiler errors?</span >
It looks like there is not mesa compiler error, according to
<a href="http://pastie.org/private/tx8oids2l8zzw5dafthbcg">http://pastie.org/private/tx8oids2l8zzw5dafthbcg</a>.
<span class="quote">>
> (In reply to Matthieu Bouron from <a href="show_bug.cgi?id=91617#c2">comment #2</a>)
> > 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
> > <a href="http://steamcommunity.com/sharedfiles/filedetails/?id=500334237">http://steamcommunity.com/sharedfiles/filedetails/?id=500334237</a>:
> > * 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
> </span >
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.
<span class="quote">> 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):
> <a href="http://ark.intel.com/products/85215/Intel-Core-i7-5600U-Processor-4M-Cache">http://ark.intel.com/products/85215/Intel-Core-i7-5600U-Processor-4M-Cache</a>-
> up-to-3_20-GHz</span ></pre>
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