View Issue Details
ID | Project | Category | View Status | Date Submitted | Last Update |
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0000672 | channel: kernel/el7 | kernel-ml | public | 2016-09-17 03:07 | 2016-09-26 16:22 |
Reporter | brad4 | Assigned To | toracat | ||
Priority | normal | Severity | minor | Reproducibility | have not tried |
Status | resolved | Resolution | no change required | ||
Summary | 0000672: kernel.sched_autogroup default differs from vendor kernel | ||||
Description | 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. | ||||
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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. |
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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. |
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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) kernel.auto_msgmni net.ipv4.ipfrag_secret_interval net.ipv6.ip6frag_secret_interval net.core.warnings |
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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. |
Date Modified | Username | Field | Change |
---|---|---|---|
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 => no change required |
2016-09-26 16:22 | toracat | Note Edited: 0004867 |