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Bug #916

closed

False-sharing in TCP hash buckets, plus size increase

Added by Dan McDonald about 12 years ago. Updated about 12 years ago.

Status:
Resolved
Priority:
Normal
Assignee:
Dan McDonald
Category:
kernel
Start date:
2011-04-18
Due date:
% Done:

100%

Estimated time:
Difficulty:
Tags:
Gerrit CR:
External Bug:

Description

This was found by Joyent as "OS-299", and fixed in the Joyent Illumos batch.

TCP hash bucket mutexes are too close together and cause false-sharing. Pad them to 64-bytes where appropriate. Also, Joyent claims the number of buckets should also be larger.

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 #1

Updated by Rich Lowe about 12 years ago

  • Status changed from New to Resolved
  • % Done changed from 0 to 100

Resolved in r13345 commit:20c193a013b8

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 #2

Updated by Garrett D'Amore about 12 years ago

Fixed in:

  1. HG changeset patch
  2. User Jerry Jelinek <>
  3. Date 1303430797 14400
  4. Node ID 20c193a013b852a0435f528a95759f9684d9115a
  5. Parent 7691b36f7461c3dda050d37858a5831a40fc2c11
    916 False-sharing in TCP hash buckets, plus size increase
    Reviewed by: Dan McDonald <>
    Reviewed by: Richard Lowe <>
    Approved by: Richard Lowe <>
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