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Bug #49879

closed

[pwl rwl] IO hang after a period of time I/O of different block sizes

Added by CONGMIN YIN about 3 years ago. Updated about 2 years ago.

Status:
Resolved
Priority:
Normal
Assignee:
CONGMIN YIN
Target version:
-
% Done:

0%

Source:
Tags:
Backport:
pacific
Regression:
No
Severity:
3 - minor
Reviewed:
Affected Versions:
ceph-qa-suite:
Pull request ID:
40493
Crash signature (v1):
Crash signature (v2):

Description

For example, VM run on the rwl cache for a long time, because VM's IO block size is not a fixed value like 4k, but 512Bto tens of megabytes. After a long time, if the pmem cache is small, it will occur fragment issue due to the defect of pmdk allocator. https://github.com/ceph/ceph/pull/39915, this PR splited the IO into 1MB extent to reduce the probability of this problem, but the problem already exists. We plan to manage pmem space and allocation by ourselves in the future.

Related issues 1 (0 open — 1 closed)

Copied to rbd - Backport #50576: pacific: [pwl rwl] IO hang after a period of time I/O of different block sizesResolvedDeepika UpadhyayActions
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 #1

Updated by Jason Dillaman about 3 years ago

  • Subject changed from librbd/cache/pwl: IO hang after a period of time rwl I/O of different block sizes to [pwl] IO hang after a period of time rwl I/O of different block sizes
  • Status changed from New to In Progress
  • Assignee set to CONGMIN YIN
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 #2

Updated by Jason Dillaman about 3 years ago

  • Project changed from Ceph to rbd
  • Category deleted (librbd)
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 #3

Updated by Ilya Dryomov almost 3 years ago

  • Status changed from In Progress to Fix Under Review
  • Pull request ID set to 40493
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 #4

Updated by Ilya Dryomov almost 3 years ago

  • Status changed from Fix Under Review to Pending Backport
  • Backport set to pacific
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 #5

Updated by Backport Bot almost 3 years ago

  • Copied to Backport #50576: pacific: [pwl rwl] IO hang after a period of time I/O of different block sizes added
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 #6

Updated by Ilya Dryomov almost 3 years ago

  • Subject changed from [pwl] IO hang after a period of time rwl I/O of different block sizes to [pwl rwl] IO hang after a period of time I/O of different block sizes
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 #7

Updated by Ilya Dryomov about 2 years ago

  • Status changed from Pending Backport to Resolved

While running with --resolve-parent, the script "backport-create-issue" noticed that all backports of this issue are in status "Resolved" or "Rejected".

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