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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - [IVB] CONFIG_PROVE_LOCKING=y causes igt/gem_exec/basic-wait-all (and possibly others) to fail"
href="https://bugs.freedesktop.org/show_bug.cgi?id=99130#c10">Comment # 10</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - [IVB] CONFIG_PROVE_LOCKING=y causes igt/gem_exec/basic-wait-all (and possibly others) to fail"
href="https://bugs.freedesktop.org/show_bug.cgi?id=99130">bug 99130</a>
from <span class="vcard"><a class="email" href="mailto:chris@chris-wilson.co.uk" title="Chris Wilson <chris@chris-wilson.co.uk>"> <span class="fn">Chris Wilson</span></a>
</span></b>
<pre>[ 154.074065] [drm:drm_ioctl] pid=2323, dev=0xe200, auth=1, I915_GEM_WAIT
[ 154.074748] i915_gem_wait_ioctl: timeout 0.500000000 -> 0.499993351
[ 154.075390] [drm:drm_ioctl] ret = -512
...
[ 155.072528] [drm:drm_ioctl] pid=2323, dev=0xe200, auth=1, I915_GEM_WAIT
[ 155.073234] i915_gem_wait_ioctl: timeout 0.488539596 -> 0.488535373
[ 155.073916] [drm:drm_ioctl] ret = -512
[ 155.074605] [drm:drm_ioctl] pid=2323, dev=0xe200, auth=1, I915_GEM_WAIT
[ 155.075307] i915_gem_wait_ioctl: timeout 0.488535373 -> 0.488532529
Walltime of 1s, but actual wait time of ~12ms.
Each ioctl is taking ~1.4ms (inside drmIoctl) with a further interval of ~0.7ms
between ioctls. And we account for 3us.</pre>
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