[LU-11548] increase default readahead tunables to match common settings Created: 19/Oct/18  Updated: 17/Feb/21  Resolved: 17/Feb/21

Status: Resolved
Project: Lustre
Component/s: None
Affects Version/s: None
Fix Version/s: Lustre 2.14.0

Type: Bug Priority: Minor
Reporter: Andreas Dilger Assignee: Wang Shilong (Inactive)
Resolution: Fixed Votes: 0
Labels: None

Issue Links:
Related
Severity: 3
Rank (Obsolete): 9223372036854775807

 Description   

It is commonly recommended to increase the readahead tunables for clients, since the current defaults are too small, having been set several years ago for slower networks and servers.

Increase the readahead defaults to better match values that are recommended today:

  • read_ahead_max_mb increased from 64MB 1GB by default (or 1/32 RAM, whichever is less)
  • read_ahead_per_file_max_mb is increased from 64MB to 128MB

 Comments   
Comment by Gerrit Updater [ 19/Oct/18 ]

Andreas Dilger (adilger@whamcloud.com) uploaded a new patch: https://review.whamcloud.com/33400
Subject: LU-11548 llite: increase readahead default values
Project: fs/lustre-release
Branch: master
Current Patch Set: 1
Commit: 56373521259f37229cd205210841104b5715e7d7

Comment by Gerrit Updater [ 02/Oct/20 ]

Oleg Drokin (green@whamcloud.com) merged in patch https://review.whamcloud.com/33400/
Subject: LU-11548 llite: increase readahead default values
Project: fs/lustre-release
Branch: master
Current Patch Set:
Commit: 4b47ec5a8e68950ced4895e1ccfdf2254c016194

Comment by Peter Jones [ 17/Feb/21 ]

Landed for 2.14

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