('invalid' = 'not beignet's bug' - I do agree it is *a* bug)
The kernel code that reads these numbers from the device
(https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/gpu/drm/i915/intel_device_info.c#n434)
does explicitly support the 47 EU case (any one of the 48 faulty and
disabled), and has nothing obviously wrong with it.
If you want to take this further, my suggested next step is:
- get the latest upstream kernel
(https://wiki.ubuntu.com/KernelTeam/GitKernelBuild)
- add #include <linux/printk.h> and lots of debug printk()s to the above
broadwell_sseu_info_init function (printk() not printf(), and under 1024 bytes
per message, as this is kernel code -
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/kernel-hacking/hacking.rst#n234)
- compile (will probably take several hours) and boot into that
- see if the issue still exists, and if it does, check /var/log/kern.log for
the debug messages you added
** Changed in: beignet (Ubuntu)
Status: In Progress => Invalid
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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:
Invalid
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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