Comment # 10
on bug 99130
from Chris Wilson
[ 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.
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