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[Bug 1543165] Comment bridged from LTC Bugzilla
------- Comment From brueckner@xxxxxxxxxx 2016-03-15 06:38 EDT-------
(In reply to comment #9)
> This bug was fixed in the package linux - 4.4.0-12.28
> linux (4.4.0-12.28) xenial; urgency=low
> * Miscellaneous Ubuntu changes
> - reconstruct: Work around orig tarball packaging limitiations
> Fixes FTBS
> -- Tim Gardner <tim.gardner@xxxxxxxxxxxxx> Tue, 08 Mar 2016 13:26:08 -0700
This release corrects the preemption kernel configuration only. The
other requested kernel configuration settings have not been updated as
suggested. I have opened further bugzillas/LPs to track these kernel
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kernel: update kernel configuration
Status in linux package in Ubuntu:
== Comment: #0 - Hendrik Brueckner <brueckner@xxxxxxxxxx> - 2016-02-08 09:41:49 ==
The below mentioned kernel configuration options are still not yet integrated into the Ubuntu kernel. In addition to the discussions on the skipper mailing list, hereby the bugzilla / launchpad to integrate and update the kernel configuration.
> Short explaination for all requested changes:
> CONFIG_NUMA (and all related config options):
> s390 gained fake NUMA support with kernel version 4.3. Performance
> measurements did show that this helps for very large machines (lot's of
> memory), and also doesn't hurt for small machines. Therfore the config
> option should be enabled.
> We only have performance numbers for non-preemptible kernels. While kernel
> preemption generally should work from a functional point of view on s390,
> we do not have numbers about the performance costs. Nor do we have any
> production systems running with kernel preemption enabled currently.
> Therefore let's please switch to PREEMPT_NONE which has proven to work.
> Hendrik already requested to disable this config option.
> Looks like all of these crept in with the kernel update to 4.3. None of
> these are relevant to s390 and can be disabled.
An updated config patch to the kernel version above will be added
Kernel-Description: s390x -- various configuration changes
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