Hi,
We are looking at accelerating video operations using
vaapi/intel-driver. When using Ivy bridge we believe that the GPU is
(almost always) not turboing even when 100% busy doing vaapi video
things (e.g. image scaling on EUs or bitstream decode). To determined
this we use cat /sys/kernel/debug/dri/0/i915_cur_delayinfo and GPU top
(todays IVB fixed vesion). We have tried a variety of IVB parts from
3610QE up to 3770 - all do the same. We've mainly been using kernel
3.2.0-24-generic and libdrm 2.4.32. The same machines turbo correctly
when doing equivent things in windows using intel media SDK.
I get the impression from mailing lists that turbo is known to have
driver/sw issues. Can anyone suggest if there is a later kernel/drm
version that might improve things? If so where do we find it? This is
for evaluation so we're happy to try unstable latest software.
Thanks!
Bloggsian
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