[Bug 1179610] Re: poor performance of resize2fs on 12.04

[Scott Moser]

I have a branch at
lp:~smoser/ubuntu/precise/e2fsprogs/resize2fs_performance/ where I think
I cherry picked the fixes, but haven't done much testing yet.

Attaching a cloud-config that can be hopefully used to test this change,
by adding the repo and then doing the resize after update/upgrade has
occurred.


** Attachment added: "user-data to test"
   https://bugs.launchpad.net/ubuntu/+source/e2fsprogs/+bug/1179610/+attachment/3675505/+files/my.ud

** Bug watch added: Debian Bug tracker #663237
   http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=663237

** Also affects: e2fsprogs (openSUSE) via
   http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=663237
   Importance: Unknown
       Status: Unknown

** No longer affects: e2fsprogs (openSUSE)

** Also affects: e2fsprogs (Debian) via
   http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=663237
   Importance: Unknown
       Status: Unknown

** Changed in: e2fsprogs (Ubuntu)
       Status: New => Confirmed

** Changed in: e2fsprogs (Ubuntu)
   Importance: Undecided => Medium

** Also affects: e2fsprogs (Ubuntu Quantal)
   Importance: Undecided
       Status: New

** Changed in: e2fsprogs (Ubuntu Quantal)
       Status: New => Fix Released

** Changed in: e2fsprogs (Ubuntu Quantal)
   Importance: Undecided => Medium

** Also affects: e2fsprogs (Ubuntu Precise)
   Importance: Undecided
       Status: New

** Changed in: e2fsprogs (Ubuntu Precise)
       Status: New => Confirmed

** Changed in: e2fsprogs (Ubuntu Precise)
   Importance: Undecided => Medium

** Changed in: e2fsprogs (Ubuntu)
       Status: Confirmed => Fix Released

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https://bugs.launchpad.net/bugs/1179610

Title:
  poor performance of resize2fs on 12.04

Status in “e2fsprogs” package in Ubuntu:
  Fix Released
Status in “e2fsprogs” source package in Precise:
  Confirmed
Status in “e2fsprogs” source package in Quantal:
  Fix Released
Status in “e2fsprogs” package in Debian:
  Unknown

Bug description:
  I just ran a simple single instance launch, and on raring i saw:
    cc_resizefs.py[DEBUG]: Resizing took 0.450 seconds
  on precise:
    cc_resizefs.py[DEBUG]: resize took 6.509745121 seconds

  Those are real time reports from /var/log/cloud-init.log for a resize
  up to 10G root from the ~1.4G that the images have built in.

  This is known-fixed in current versions (quantal and later).
  The changes were done to upstream e2fsprogs under debian bug 663237.

  Bug 978012 is a general request for a newer e2fsprogs, and this bug is
  a specific request for the performance improvements.

  Related bugs:
   * bug 978012: Please SRU micro bug fix release of e2fsprogs 1.42.4-3ubuntu1
     (main) from Quantal (main)
   * debian bug 663237: Make resize2fs shrinking use much less CPU

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