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Bug #9707

open

Enable parallel crash dump

Added by Yuri Pankov over 2 years ago. Updated over 2 years ago.

Status:
In Progress
Priority:
Normal
Assignee:
Category:
kernel
Start date:
2018-08-07
Due date:
% Done:

50%

Estimated time:
Difficulty:
Medium
Tags:
Gerrit CR:

Description

#9694 addressed the hang that was prohibiting the use of parallel crash dump. It is still disabled by default.

We should consider enabling parallel crash dump by default. This entails determining the optimum default settings for the tunables that control when parallel dump is used (vs serial) and either introducing a mechanism to disable bzip2, or removing the bzip2 support. At the moment, to enable parallel dump but not bzip2, dump_plat_mincpu needs to be set to a number greater than the number of CPUs on the system, which isn't ideal.

ratio time page/sec compress ns/page pages
Serial lzjb (live) 5.94 31 89939 6688 2911045
Parallel lzjb (live) 5.84 14 199131 9566 2912521
Serial lzjb 6.02 67 43426 13834 2911060
Parallel lzjb 5.90 18 161786 3430 2788110
Parallel bzip2 (level 1) 17.23 92 31641 974201 2787836
Parallel bzip2 (level 5) 18.96 107 27219 1129610 2909551
Parallel bzip2 (level 9) 19.37 124 23476 1313436 2912165
Actions #1

Updated by Yuri Pankov over 2 years ago

  • Description updated (diff)
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