[Bug 100899] New: Enable UMD to control GPGPU EUs slice number in static/dynamic way
bugzilla-daemon at freedesktop.org
bugzilla-daemon at freedesktop.org
Tue May 2 00:29:27 UTC 2017
https://bugs.freedesktop.org/show_bug.cgi?id=100899
Bug ID: 100899
Summary: Enable UMD to control GPGPU EUs slice number in
static/dynamic way
Product: DRI
Version: unspecified
Hardware: Other
OS: All
Status: NEW
Severity: enhancement
Priority: medium
Component: DRM/Intel
Assignee: intel-gfx-bugs at lists.freedesktop.org
Reporter: dmitry.v.rogozhkin at intel.com
QA Contact: intel-gfx-bugs at lists.freedesktop.org
CC: intel-gfx-bugs at lists.freedesktop.org
Media workloads performance may suffer because of the cost associated with
managing of GPGPU EUs slices which are not required for the workloads (media
workloads may use no more than certain number of EUs at the same time due to
wave front limitation). Usually the rule is: lower stream resolution, lower
number of EUs slices is needed. According to experiments, performance may be
5-20% lower from the optimal operating point. This under performance is one of
the key factors why in certain use cases SKL is slower than BDW assuming all
other system settings except EU aligned.
Here is a link to the feature request to provide an API on the UMD level to
permit user to control number of slices selections to potentially benefit the
performance: https://github.com/01org/intel-vaapi-driver/issues/152
Here are links to the RFC i915 drm-tip patches to enable static slice shutdown
for BDW and SKL:
* https://patchwork.kernel.org/patch/9670509/ [RFC,2/2] drm/i915/bdw: permit
make_rpcs execution on BDW to enable slice shutdown
* https://patchwork.kernel.org/patch/9670507/ [RFC,1/2] drm/i915/skl: add slice
shutdown debugfs interface
These patches can be used to demonstrate influence of EUs slice numbers on the
media workloads. Refer to
https://github.com/01org/intel-vaapi-driver/issues/152 for the reproducing
details.
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