FS#49467 - [linux] 4.6.x Intel-pstate in kernel 4.6 has performance regressions
Attached to Project:
Arch Linux
Opened by Alexander Pavel (SuperIce97) - Wednesday, 25 May 2016, 23:06 GMT
Last edited by Eli Schwartz (eschwartz) - Monday, 02 October 2017, 23:19 GMT
Opened by Alexander Pavel (SuperIce97) - Wednesday, 25 May 2016, 23:06 GMT
Last edited by Eli Schwartz (eschwartz) - Monday, 02 October 2017, 23:19 GMT
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Details
Description: Intel-pstate has major performance regressions
in kernel 4.6. The kernel should not be updated until this
is fixed to prevent major slowdowns on Intel based PCs.
http://www.phoronix.com/scan.php?page=news_item&px=P-State-Possible-4.6-Regression
Additional info: Kernel 4.6 (currently in testing) Steps to reproduce: CPU benchmark kernel 4.5 vs 4.6 on an Intel-based PC with the intel-pstate scaling driver. |
This task depends upon
Closed by Eli Schwartz (eschwartz)
Monday, 02 October 2017, 23:19 GMT
Reason for closing: Not a bug
Additional comments about closing: We have upgraded the kernel a number of times, even. If there are specific issues that can be fixed, report them upstream or ask upstream to recall a kernel release "because benchmarks omg".
Monday, 02 October 2017, 23:19 GMT
Reason for closing: Not a bug
Additional comments about closing: We have upgraded the kernel a number of times, even. If there are specific issues that can be fixed, report them upstream or ask upstream to recall a kernel release "because benchmarks omg".
Comment by
Arup Roy Chowdhury (Arup) -
Wednesday, 08 June 2016, 16:36 GMT
Installed 4.6 today with a Haswell i4790. With earlier kernels due
to the config MHz=300 setting in Arch kernel, there would be no
CPU scaling. Now with this kernel, its all normal like in SUSE and
Ubuntu and Fedora kernels.