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|ID||Category||Severity||Reproducibility||Date Submitted||Last Update|
|0000672||[channel: kernel/el7] kernel-ml||minor||have not tried||2016-09-17 03:07||2016-09-26 16:22|
|Priority||normal||Resolution||not a bug|
|Summary||0000672: kernel.sched_autogroup default differs from vendor kernel|
sysctl kernel.sched_autogroup_enabled defaults to 1 in elrepo kernel(at least 7-ml and 7-lt), while 0 in vendors kernel.
It is not noticeable on desktop machines, but on 32-core machine it is quite visible that multiple threads get stuffed on 22 CPU cores.
|Additional Information||Fix should be one-line patch against kernel/sched_autogroup.c to set sysctl default, or as I work around now just add it to sysctl.conf/|
|Tags||No tags attached.|
|If this was something that could be set withing kernel config files, we would have been able to make necessary changes. However this requires a change in the kernel code. As we are supposed to build the source code "as is", we will not be able to do the suggested modification.|
|What we could do is to add a note to our wiki pages that alerts users that may be affected by the difference in this default option.|
Such resolution is perfect for me. Probably tell to make /etc/sysctl.d/*.conf with a healthy warning to not fix what is not broken ;)
also flipped to zero
kernel.nmi_watchdog (default is zero as per kernel doc, vendors disagree)
It is expected to log unhandled NMI-s post factum. Usually there is some other driver handling NMIs that are not genuine HW faults.
(and some obsoleted just went away over time)
edited on: 2016-09-26 16:22
The Known Issues section of the kernel-ml wiki page ( http://elrepo.org/tiki/kernel-ml [^] ) has been updated with a reference to this bug report.
I'm closing this but please feel free to reopen if you have further comments to make.
|2016-09-17 03:07||brad4||New Issue|
|2016-09-17 03:07||brad4||Status||new => assigned|
|2016-09-17 03:07||brad4||Assigned To||=> burakkucat|
|2016-09-17 07:12||toracat||Note Added: 0004861|
|2016-09-17 10:10||toracat||Note Added: 0004863|
|2016-09-17 17:15||brad4||Note Added: 0004865|
|2016-09-26 08:54||burakkucat||Assigned To||burakkucat => toracat|
|2016-09-26 16:22||toracat||Note Added: 0004867|
|2016-09-26 16:22||toracat||Status||assigned => resolved|
|2016-09-26 16:22||toracat||Resolution||open => not a bug|
|2016-09-26 16:22||toracat||Note Edited: 0004867|
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