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From: Launchpad Bug Tracker <1751264@bugs.launchpad.net>
To: qemu-devel@nongnu.org
Subject: [Bug 1751264] Re: qemu-img convert issue in a tmpfs partition
Date: Mon, 21 Jun 2021 04:17:18 -0000	[thread overview]
Message-ID: <162424903870.11837.2074864818330726620.malone@loganberry.canonical.com> (raw)
In-Reply-To: 151939024836.30479.4933664010119224710.malonedeb@gac.canonical.com

[Expired for QEMU because there has been no activity for 60 days.]

** Changed in: qemu
       Status: Incomplete => Expired

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https://bugs.launchpad.net/bugs/1751264

Title:
  qemu-img convert issue in a tmpfs partition

Status in QEMU:
  Expired

Bug description:
  qemu-img convert command is slow when the file to convert is located
  in a tmpfs formatted partition.

  v2.1.0 on debian/jessie x64, ext4: 10m14s
  v2.1.0 on debian/jessie x64, tmpfs: 10m15s

  v2.1.0 on debian/stretch x64, ext4: 11m9s
  v2.1.0 on debian/stretch x64, tmpfs: 10m21.362s

  v2.8.0 on debian/jessie x64, ext4: 10m21s
  v2.8.0 on debian/jessie x64, tmpfs: Too long (50min+)

  v2.8.0 on debian/stretch x64, ext4: 10m42s
  v2.8.0 on debian/stretch x64, tmpfs: Too long (50min+)

  It seems that the issue is caused by this commit :
  https://github.com/qemu/qemu/commit/690c7301600162421b928c7f26fd488fd8fa464e

  In order to reproduce this bug :

  1/ mount a tmpfs partition : mount -t tmpfs tmpfs /tmp
  2/ get a vmdk file (we used a 15GB image) and put it on /tmp
  3/ run the 'qemu-img convert -O qcow2 /tmp/file.vmdk /path/to/destination' command

  When we trace the process, we can see that there's a lseek loop which
  is very slow (compare to outside a tmpfs partition).

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      parent reply	other threads:[~2021-06-21  4:34 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-02-23 12:50 [Qemu-devel] [Bug 1751264] [NEW] qemu-img convert issue in a tmpfs partition Teddy VALETTE
2018-02-26 13:28 ` [Qemu-devel] [Bug 1751264] " Teddy VALETTE
2018-02-26 16:08 ` Max Reitz
2021-04-21  6:28 ` Thomas Huth
2021-06-21  4:17 ` Launchpad Bug Tracker [this message]

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