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Message #165469
[Bug 1543165] Re: kernel: update kernel configuration
** Description changed:
== 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.
- >
- > 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.
+ > 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
+
+
+ ====
+ Kernel-Description: s390x -- clear out hardware related configuration item
** Changed in: linux (Ubuntu)
Milestone: ubuntu-16.02 => ubuntu-16.03
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https://bugs.launchpad.net/bugs/1543165
Title:
kernel: update kernel configuration
Status in linux package in Ubuntu:
Triaged
Bug description:
== 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.
>
> 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
====
Kernel-Description: s390x -- clear out hardware related configuration item
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