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Bug #5395

closed

arm: osd: big performance differential between read/write

Added by Sage Weil almost 11 years ago. Updated over 9 years ago.

Status:
Can't reproduce
Priority:
High
Assignee:
Mark Nelson
Category:
OSD
Target version:
-
% Done:

0%

Source:
Support
Tags:
Backport:
Regression:
Severity:
3 - minor
Reviewed:
Affected Versions:
ceph-qa-suite:
Pull request ID:
Crash signature (v1):
Crash signature (v2):

Description

-- arm --

Raw /dev/rbd device

$ sudo dd if=/dev/zero of=/dev/rbd1 bs=4M count=128 conv=fdatasync
128+0 records in
128+0 records out
536870912 bytes (537 MB) copied, 2.37645 s, 226 MB/s

$ sudo dd if=/dev/rbd1 of=/dev/null bs=4M count=128
128+0 records in
128+0 records out
536870912 bytes (537 MB) copied, 33.2722 s, 16.1 MB/s

-- x86 --

  1. dd if=/dev/zero of=/dev/rbd1 bs=4M count=128 conv=fdatasync
    128+0 records in
    128+0 records out
    536870912 bytes (537 MB) copied, 1.88273 s, 285 MB/s
  1. dd of=/dev/null if=/dev/rbd1 bs=4M count=128
    128+0 records in
    128+0 records out
    536870912 bytes (537 MB) copied, 3.76684 s, 143 MB/s
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 #1

Updated by Sage Weil over 10 years ago

is this still present?

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 #2

Updated by Sage Weil over 9 years ago

  • Status changed from 12 to Can't reproduce
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