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Bug #6281

prefetching should apply to 1MB reads

Added by Matthew Ahrens about 4 years ago. Updated about 4 years ago.

Status:
Closed
Priority:
Normal
Category:
zfs - Zettabyte File System
Start date:
2015-10-02
Due date:
% Done:

100%

Estimated time:
Difficulty:
Medium
Tags:
needs-triage

Description

We should allow prefetching up to and including the value of zfetch_array_rd_sz (default 1MB), as was the case before the fix for 5987 was integrated.

Workaround: Increase the zfetch_array_rd_sz so that's it's greater than 1MB:
echo "zfetch_array_rd_sz/W 0t1048577" | mdb -kw

History

#1

Updated by Electric Monk about 4 years ago

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

git commit 632802744ef6d17e06d6980a95f631615c3b060f

commit  632802744ef6d17e06d6980a95f631615c3b060f
Author: George Wilson <george.wilson@delphix.com>
Date:   2015-10-07T15:58:52.000Z

    6281 prefetching should apply to 1MB reads
    Reviewed by: Matthew Ahrens <mahrens@delphix.com>
    Reviewed by: Paul Dagnelie <pcd@delphix.com>
    Reviewed by: Alexander Motin <mav@freebsd.org>
    Reviewed by: Dan McDonald <danmcd@omniti.com>
    Reviewed by: Justin Gibbs <gibbs@scsiguy.com>
    Reviewed by: Xin Li <delphij@freebsd.org>
    Approved by: Gordon Ross <gordon.ross@nexenta.com>

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