[RFC 0/3] Dynamic SSEU mashup

[Navik, Ankit P]

Hi Tvrtko, 

Thank you for taking time to work on this. 

> -----Original Message-----
> From: Tvrtko Ursulin <tvrtko.ursulin at linux.intel.com>
> Sent: Thursday, January 9, 2020 10:24 PM
> To: intel-gfx-trybot at lists.freedesktop.org
> Cc: Navik, Ankit P <ankit.p.navik at intel.com>; Ursulin, Tvrtko
> <tvrtko.ursulin at intel.com>
> Subject: [RFC 0/3] Dynamic SSEU mashup
> 
> From: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
> 
> Hi Ankit,
> 
> A few points with these patches:
> 
> They are rough, unfinished and altogether bad. However I promised you
> something this week so please give them a spin to see how perf and power looks
> on your system. They survived some smoke testing on my end and did not seem
> to regress gfxbench3.
> 
> I got bogged down with request counting so I changed the approach completely
> and instead of counting outstanding requests I am counting completed requests
> per context and per engine class. Maybe it's the same - answers the question on
> how active is the context.
> 
> I changed the heuristic to look at a sliding window weighted average of
> completed requests. This is because when I looked at the previous logic, its
> behaviour looked completely wrong to me. It was constantly selecting lowest
> load type for many heavy workloads.
> 
> But I am not happy at all with my weighted past history. I am pretty sure that on
> top we would need to force periodic re-configurations (context re-pin).
> 
> Even with all these changes I'm afraid to say I started to doubt in any request
> counting heuristic even more than I have before. I am very curious what your
> testing will show, but I don't know how we could do this properly without maybe
> hooking into OA so we can know (rather than guess) how wide the workloads
> are.
> 
> Many opens.. but as said, I ran out of time to make this any better this week.
> Please test and we will see.

Yes, Let me test it and I'll share results soon with it. 

Regards, 
Ankit
> 
> Ankit Navik (1):
>   drm/i915: set optimum eu/slice/sub-slice configuration based on load
>     type
> 
> Tvrtko Ursulin (2):
>   drm/i915: Track per context/class rq completion frequency
>   drm/i915: Record if context has user SSEU configuration applied
> 
>  drivers/gpu/drm/i915/gem/i915_gem_context.c   | 14 +++++
>  .../gpu/drm/i915/gem/i915_gem_context_types.h | 17 ++++++
>  drivers/gpu/drm/i915/gt/intel_context.c       | 52 +++++++++++++++++
>  drivers/gpu/drm/i915/gt/intel_context_types.h |  5 ++
>  drivers/gpu/drm/i915/gt/intel_lrc.c           | 22 +++++--
>  drivers/gpu/drm/i915/gt/intel_sseu.c          | 46 +++++++++++++++
>  drivers/gpu/drm/i915/gt/intel_sseu.h          |  4 ++
>  drivers/gpu/drm/i915/i915_drv.h               |  5 ++
>  drivers/gpu/drm/i915/i915_sysfs.c             | 34 +++++++++++
>  drivers/gpu/drm/i915/intel_device_info.c      | 57 ++++++++++++++++++-
>  10 files changed, 250 insertions(+), 6 deletions(-)
> 
> --
> 2.20.1