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<b><a class="bz_bug_link
bz_status_REOPENED "
title="REOPENED - [SKL] Unigine Heaven 4.0 fails to GPU hangs"
href="https://bugs.freedesktop.org/show_bug.cgi?id=103556#c31">Comment # 31</a>
on <a class="bz_bug_link
bz_status_REOPENED "
title="REOPENED - [SKL] Unigine Heaven 4.0 fails to GPU hangs"
href="https://bugs.freedesktop.org/show_bug.cgi?id=103556">bug 103556</a>
from <span class="vcard"><a class="email" href="mailto:lionel.g.landwerlin@linux.intel.com" title="Lionel Landwerlin <lionel.g.landwerlin@linux.intel.com>"> <span class="fn">Lionel Landwerlin</span></a>
</span></b>
<pre>(In reply to Eero Tamminen from <a href="show_bug.cgi?id=103556#c30">comment #30</a>)
<span class="quote">> The hang issues I've filed (this and compute) one are too rare/random to be
> bisectable.
>
> In last few days, I got one hang in Heaven on SKL GT2 two days ago, one hang
> on SKL GT3e yesterday (and one hang in CarChase on SKL GT4e yesterday).
> This is from doing 3 runs, few times on different gfx stack setups every
> day, on each of the machines.
>
> On other machines than SKL, they're much rarer (attached BDW hang is the
> only one I've noticed).</span >
I'm starting to think we might have a problem with the tracking of the aperture
available.
By default it seems to be set to 4Gb, but that doesn't make sense to me on
gen8+, I would expect 2^48 (48bits of address space).
Reducing that number to like 200Mb in i965 triggers all kind of random hangs
with Heaven.
4Gb might be big enough to only trigger issues after a long time.
It would explain the difficulty to reproduce.
Anyway that's my current track, I'll try to understand this better with Ken.</pre>
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