cannot set hmcdrv cachesize to 1GB
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
Ubuntu on IBM z Systems |
Won't Fix
|
Undecided
|
bugproxy | ||
linux (Ubuntu) |
Won't Fix
|
Undecided
|
Unassigned |
Bug Description
On an LPAR, execute Customize/Delete Activation Profile. Customize profile. In security section, tick "Input/Output (I/O) configuration control". Save. Ok. Close.
Execute Deactivate task.
Execute Activate task.
ssh into lpar.
Try to modprobe hmcdrv module, whilst setting cachesize to 1GiB. Going down to the smallest permissible value.
First, observe that suffixes do not appear to be accepted, despite the documentation stating that it should be supported:
ubuntu@s1lp7:~$ sudo modprobe hmcdrv cachesize=1G
modprobe: ERROR: could not insert 'hmcdrv': Invalid argument
ubuntu@s1lp7:~$ sudo modprobe hmcdrv cachesize=512M
modprobe: ERROR: could not insert 'hmcdrv': Invalid argument
Next try to request largish amounts of cache, and note how those calls fail:
$ sudo modprobe hmcdrv cachesize=134217728
modprobe: ERROR: could not insert 'hmcdrv': Cannot allocate memory
$ sudo modprobe hmcdrv cachesize=67108864
modprobe: ERROR: could not insert 'hmcdrv': Cannot allocate memory
$ sudo modprobe hmcdrv cachesize=33554432
modprobe: ERROR: could not insert 'hmcdrv': Cannot allocate memory
$ sudo modprobe hmcdrv cachesize=16777216
modprobe: ERROR: could not insert 'hmcdrv': Cannot allocate memory
$ sudo modprobe hmcdrv cachesize=8388608
modprobe: ERROR: could not insert 'hmcdrv': Cannot allocate memory
$ sudo modprobe hmcdrv cachesize=4194304
modprobe: ERROR: could not insert 'hmcdrv': Cannot allocate memory
$ sudo modprobe hmcdrv cachesize=2097152
modprobe: ERROR: could not insert 'hmcdrv': Cannot allocate memory
$ sudo modprobe hmcdrv cachesize=2097152
modprobe: ERROR: could not insert 'hmcdrv': Cannot allocate memory
# 1MiB + 2048 bytes
$ sudo modprobe hmcdrv cachesize=1050624
modprobe: ERROR: could not insert 'hmcdrv': Cannot allocate memory
$ sudo modprobe hmcdrv cachesize=1048576
$ echo $?
0
The LPAR in question is configured with 2000MB of storage (RAM/memory), thus imho should be able to handle more than 1MiB cachesize, when there are more than 900MiB of free storage:
$ free -h
total used free shared buff/cache available
Mem: 1.7Gi 348Mi 913Mi 0.0Ki 459Mi 1.3Gi
Swap: 1.9Gi 0B 1.9Gi
Is 1MiB some kind of a cachesize limit of the hmcdrv module? Can it be fixed and/or bumped to be unlimited? I'm looking forward to be able to use a 1GiB cachesize.
---
ProblemType: Bug
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AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay'
ApportVersion: 2.20.10-0ubuntu14
Architecture: s390x
ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord': 'arecord'
CRDA: Error: command ['iw', 'reg', 'get'] failed with exit code 1: nl80211 not found.
DistroRelease: Ubuntu 19.04
IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig': 'iwconfig'
Lsusb: Error: command ['lsusb'] failed with exit code 1:
Package: linux (not installed)
PciMultimedia:
ProcEnviron:
TERM=xterm-
PATH=(custom, no user)
XDG_RUNTIME_
LANG=C
SHELL=/bin/bash
ProcFB: Error: [Errno 2] No such file or directory: '/proc/fb'
ProcKernelCmdLine: root=UUID=
ProcVersionSign
RelatedPackageV
linux-
linux-
linux-firmware 1.176
RfKill: Error: [Errno 2] No such file or directory: 'rfkill': 'rfkill'
Tags: disco
Uname: Linux 4.18.0-11-generic s390x
UpgradeStatus: Upgraded to disco on 2018-11-20 (10 days ago)
UserGroups: adm cdrom cpacfstats dip kvm libvirt lpadmin lxd plugdev sambashare sbuild sudo
_MarkForUpload: True
tags: | added: architecture-s39064 bugnameltc-173729 severity-high targetmilestone-inin1804 |
tags: | added: kernel-da-key |
apport information