[LU-14134] reduce credits for new writing potentially Created: 12/Nov/20  Updated: 29/Jan/22  Resolved: 03/Dec/20

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

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

Issue Links:
Related
is related to LU-14304 parallel-scale-nfsv3 test racer_on_nf... Open
is related to LU-14729 read-only remount due to transaction ... Resolved
is related to LU-9985 osd_read_prep() ignores errors from o... Resolved
is related to LU-14187 LU-14134 causes many racer timeouts Resolved
is related to LU-14641 per extents bytes allocation stats Resolved
Rank (Obsolete): 9223372036854775807

 Description   

For new writting, Lustre reserve credits in worst cases, eg for 1M write, we need reserve more than 500 credits.

This means we need much more journal space than data for each write, which means we need large journal to reach good performance.

One of potential way to improve this could be we allow transaction restart for write commit
case.

 Comments   
Comment by Gerrit Updater [ 12/Nov/20 ]

Wang Shilong (wshilong@whamcloud.com) uploaded a new patch: https://review.whamcloud.com/40626
Subject: LU-14134 osd-ldiskfs: reduce credits for new writting
Project: fs/lustre-release
Branch: master
Current Patch Set: 1
Commit: 90fb6ddc38265c7025676328d9eead4d6a3d3e51

Comment by Gerrit Updater [ 03/Dec/20 ]

Oleg Drokin (green@whamcloud.com) merged in patch https://review.whamcloud.com/40626/
Subject: LU-14134 osd-ldiskfs: reduce credits for new writing
Project: fs/lustre-release
Branch: master
Current Patch Set:
Commit: 0271b17b80a82c132076a839385d3d8d8344c849

Comment by Peter Jones [ 03/Dec/20 ]

Landed for 2.14

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