Public bug reported: == Comment: #0 - Hendrik Brueckner <[email protected]> - 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.
>
>
>
> CONFIG_PREEMPT_NONE:
>
> 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.
>
>
>
> CONFIG_SCSI_SCAN_ASYNC:
>
> Hendrik already requested to disable this config option.
>
>
>
> CONFIG_REGMAP,
>
> CONFIG_NET_VENDOR_EMULEX,
>
> CONFIG_BE2NET,
>
> CONFIG_BE2NET_VXLAN,
>
> CONFIG_NET_VENDOR_SYNOPSYS,
>
> CONFIG_NVMEM:
>
> 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
** Affects: ubuntu
Importance: Undecided
Assignee: Skipper Bug Screeners (skipper-screen-team)
Status: New
** Tags: architecture-s39064 bugnameltc-136728 severity-high
targetmilestone-inin1604
** Tags added: architecture-s39064 bugnameltc-136728 severity-high
targetmilestone-inin1604
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https://bugs.launchpad.net/bugs/1543165
Title:
kernel: update kernel configuration
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