** Package changed: ubuntu => linux (Ubuntu)
** Changed in: linux (Ubuntu)
Importance: Undecided => High
** Changed in: linux (Ubuntu)
Status: New => Triaged
** Changed in: linux (Ubuntu)
Assignee: Taco Screen team (taco-screen-team) => Canonical Kernel Team
(canonical-kernel-team)
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https://bugs.launchpad.net/bugs/1560552
Title:
ISST-LTE: pVM:high cpus number need a high crashkernel value in kdump
Status in linux package in Ubuntu:
Triaged
Bug description:
The kdump kernel will be booted with "maxcpus=1", so no matter how many cpus
this system has, only one cpu will be brought up during kdump I think. But on
LPAR thymelp2, if we allocate 40 cpus on it, then kdump works just fine with
512M as crashkernel value. But if we allocate 200 cpus on it, kdump fails by
trggering OOM. It has been proved that in latter situation we need 1.5G RAM
reserved for kdump to let it works.
Contact Information = Ping Tian Han/[email protected] Carrie
Mitsuyoshi/[email protected]
---uname output---
Linux thymelp2 4.2.0-23-generic #28~14.04.1-Ubuntu SMP Thu Dec 31 13:41:19
UTC 2015 ppc64le ppc64le ppc64le GNU/Linux
Machine Type = 8247-22L, LPAR
---Debugger---
A debugger was configured, however the system did not enter into the debugger
---Steps to Reproduce---
1. configure kdump with crashkernel=512M on thymelp2
2. allcoate 40 cpus on thymelp2 and trigger kdump
3. allocate 200 cpus on thymelp2 then do kdump again
*Additional Instructions for Ping Tian Han/[email protected] Carrie
Mitsuyoshi/[email protected]:
-Post a private note with access information to the machine that the bug is
occuring on.
== Comment: #1 - Nadia N. Fry <[email protected]> - 2016-02-19 13:53:02 ==
Any update?
== Comment: #2 - Hari Krishna Bathini <[email protected]> - 2016-02-22
03:40:05 ==
Mahesh posted a patch upstream which should take care of this problem
http://patchwork.ozlabs.org/patch/577193/
Thanks
Hari
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