[Bug 1800752] Re: [regression] Wrong EU count for i5-5250U, reducing OpenCL performance

I've been looking (briefly) for some docs on the Intel GPU hardware
layout.

Came across this:
https://01.org/linuxgraphics/documentation/hardware-specification-prms
leading to:
https://01.org/sites/default/files/documentation/intel-gfx-prm-osrc-bdw-vol04-configurations_3.pdf

which says that a Intel HD graphics 6000 set-up (which is what this
system has) will have 47* EUs.

*(*) Intel reserves the right to increase the number of EUs on these
SKUs.

So perhaps this is a strange oddity that doesn't fit into the mask
counting?

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https://bugs.launchpad.net/bugs/1800752

Title:
[regression] Wrong EU count for i5-5250U, reducing OpenCL performance

Status in beignet package in Ubuntu:
In Progress
Status in linux package in Ubuntu:
Confirmed

Bug description:
I run a BOINC project which uses opencl_intel on my Kubunut system

On bioinc the tasks ran in 12,000 +/- 200 seconds.
They've been doing that for ~6 months.

I've now updated the system to cosmic, and the task are not taking
19,000 +/- 200s.

I have another system (which is still running Mint18.3 - and hasn't
changed) which also runs these tasks and the timings there have not
changed, so the tasks themselves are still equivalent.

ProblemType: Bug
DistroRelease: Ubuntu 18.10
Package: beignet-opencl-icd 1.3.2-4
ProcVersionSignature: Ubuntu 4.18.0-10.11-generic 4.18.12
Uname: Linux 4.18.0-10-generic x86_64
ApportVersion: 2.20.10-0ubuntu13
Architecture: amd64
CurrentDesktop: KDE
Date: Wed Oct 31 01:17:08 2018
InstallationDate: Installed on 2018-05-09 (174 days ago)
InstallationMedia: Kubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
SourcePackage: beignet
UpgradeStatus: Upgraded to cosmic on 2018-10-26 (4 days ago)
---
ProblemType: Bug
ApportVersion: 2.20.10-0ubuntu13
Architecture: amd64
DistroRelease: Ubuntu 18.10
InstallationDate: Installed on 2018-03-23 (228 days ago)
InstallationMedia: Kubuntu 18.04 LTS "Bionic Beaver" - Alpha amd64 (20180306.1)
Package: linux
PackageArchitecture: amd64
ProcVersionSignature: Ubuntu 4.18.0-10.11-generic 4.18.12
Tags: cosmic
Uname: Linux 4.18.0-10-generic x86_64
UpgradeStatus: Upgraded to cosmic on 2018-10-28 (9 days ago)
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