Public bug reported:
The Ubuntu kernel configuration contains CONFIG_MEMORY_HOTPLUG_DEFAULT_ONLINE=y
for s390.
This causes all standby memory configured for an LPAR to be used at IPL time.
Note that this is definetaly not what a user wants on s390.
The normal process is: define a certain amount of "base" memory which the
system should use when IPL'ed, and define also a certain amount of "standby"
memory which can be (also only partially) be additionaly used when necessary.
Also note that it is *not* possible to add additional memory to a runnung
system, besides the amount of memory specified as "standby".
Therefore please change the kernel config option
CONFIG_MEMORY_HOTPLUG_DEFAULT_ONLINE to "n" for s390.
** Affects: linux (Ubuntu)
Importance: Undecided
Assignee: Skipper Bug Screeners (skipper-screen-team)
Status: New
** Tags: architecture-s39064 bugnameltc-181933 severity-high
targetmilestone-inin1804
** Tags added: architecture-s39064 bugnameltc-181933 severity-high
targetmilestone-inin1804
** Changed in: ubuntu
Assignee: (unassigned) => Skipper Bug Screeners (skipper-screen-team)
** Package changed: ubuntu => linux (Ubuntu)
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https://bugs.launchpad.net/bugs/1848492
Title:
Change Config Option "CONFIG_MEMORY_HOTPLUG_DEFAULT_ONLINE=y" -> "n"
Status in linux package in Ubuntu:
New
Bug description:
The Ubuntu kernel configuration contains
CONFIG_MEMORY_HOTPLUG_DEFAULT_ONLINE=y for s390.
This causes all standby memory configured for an LPAR to be used at IPL time.
Note that this is definetaly not what a user wants on s390.
The normal process is: define a certain amount of "base" memory which the
system should use when IPL'ed, and define also a certain amount of "standby"
memory which can be (also only partially) be additionaly used when necessary.
Also note that it is *not* possible to add additional memory to a runnung
system, besides the amount of memory specified as "standby".
Therefore please change the kernel config option
CONFIG_MEMORY_HOTPLUG_DEFAULT_ONLINE to "n" for s390.
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