[Bug 1543165] Re: kernel: update kernel configuration

[Andy Whitcroft]

For clarity it did also enable NUMA, though there are further
corrections to be made there.  It also disabled a number of redundant
hardware options as requested.  It did not change the ASYNC option which
I will discuss in the newly opened bug.

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Title:
  kernel: update kernel configuration

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[Bug 1543165] Re: kernel: update kernel configuration

[Launchpad Bug Tracker]

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   Tue, 08 Mar 2016 13:26:08
-0700

** Changed in: linux (Ubuntu)
   Status: Triaged => Fix Released

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Title:
  kernel: update kernel configuration

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[Bug 1543165] Re: kernel: update kernel configuration

[Andy Whitcroft]

** Description changed:

  == Comment: #0 - Hendrik Brueckner  - 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
+ Kernel-Description: s390x -- various configuration changes

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[Bug 1543165] Re: kernel: update kernel configuration

[Tim Gardner]

Why are we diverging from other architectures ? There is nothing in this
bug that describes any deleterious effects caused by these config
settings.

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Title:
  kernel: update kernel configuration

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[Bug 1543165] Re: kernel: update kernel configuration

[Andy Whitcroft]

** Description changed:

  == Comment: #0 - Hendrik Brueckner  - 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 

[Bug 1543165] Re: kernel: update kernel configuration

[Dimitri John Ledkov]

The following config changes will be fixed soon:
CONFIG_NUMA
CONFIG_REGMAP
CONFIG_NET_VENDOR_EMULEX
CONFIG_BE2NET
CONFIG_BE2NET_VXLAN
CONFIG_NET_VENDOR_SYNOPSYS
CONFIG_NVMEM

The requests below two keys are currently out of scope, with the generic kernel 
config policy for Ubuntu:
CONFIG_PREEMPT_NONE
CONFIG_SCSI_SCAN_ASYNC

We ship PREEMPT_VOLUNTARY & CONFIG_SCSI_SCAN_ASYNC on all architectures
(including ppc64, ppc64el, and s390x) and this is what we support and
have shipped at least since lucid (6 years +). If you really want to
escalate changes to these two config keys from what Ubuntu users expect
on Ubuntu, please provide details of fundamental s390x architecture
specific difference that result in worse generic performance when
configured like we currently have; or for example why that's the wrong
thing to do across all architectures. To me, both of those config keys
are more-or-less architecture-agnostic and in general improve
performance without significant performance impacts. BTW, IBM z/KVM
appears to ship with CONFIG_SCSI_SCAN_ASYNC=y too.

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Title:
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[Bug 1543165] Re: kernel: update kernel configuration

[Christopher M. Penalver]

** Changed in: linux (Ubuntu)
   Status: Confirmed => Triaged

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[Bug 1543165] Re: kernel: update kernel configuration

[Gary Gaydos]

** Package changed: ubuntu => linux (Ubuntu)

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Title:
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[Bug 1543165] Re: kernel: update kernel configuration

[dann frazier]

** 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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[Bug 1543165] Re: kernel: update kernel configuration

[Andy Whitcroft]

** Changed in: linux (Ubuntu)
 Assignee: Canonical Kernel Team (canonical-kernel-team) => Andy Whitcroft 
(apw)

** Changed in: linux (Ubuntu)
Milestone: None => ubuntu-16.02

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