** Changed in: linux (Ubuntu)
Assignee: Skipper Bug Screeners (skipper-screen-team) => Canonical Kernel
Team (canonical-kernel-team)
** Changed in: linux (Ubuntu)
Importance: Undecided => High
** Changed in: linux (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1543165
Title:
kernel: update kernel configuration
Status in linux package in Ubuntu:
Confirmed
Bug description:
== Comment: #0 - Hendrik Brueckner <brueck...@de.ibm.com> - 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
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