[Qemu-devel] [Bug 1126369] Re: qemu-img snapshot -c is unreasonably slow

[Qemu-devel] [Bug 1126369] Re: qemu-img snapshot -c is unreasonably slow

[Thomas Huth]

Looking through old bug tickets... have this issue been fixed, i.e.
could we close this ticket nowadays? Or is there still something left to
do?

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

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Title:
  qemu-img snapshot -c is unreasonably slow

Status in QEMU:
  Incomplete

Bug description:
  Something fishy is going on with qcow2 internal snapshot creation
  times.  I don't know if this is a regression because I haven't used
  internal snapshots in the past.

  QEMU 1.4-rc2:
  $ qemu-img create -f qcow2 test.qcow2 -o size=50G,preallocation=metadata
  $ time qemu-img snapshot -c new test.qcow2
  real	3m39.147s
  user	0m10.748s
  sys	0m26.165s

  (This is on an SSD)

  I expect snapshot creation to take under 1 second.

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[Qemu-devel] [Bug 1126369] Re: qemu-img snapshot -c is unreasonably slow

[Stefan Hajnoczi]

Code inspection shows that qcow2_update_cluster_refcount() no longer
calls bdrv_flush().  This issue has been fixed.

** Changed in: qemu
       Status: Incomplete => Fix Released

-- 
You received this bug notification because you are a member of qemu-
devel-ml, which is subscribed to QEMU.
https://bugs.launchpad.net/bugs/1126369

Title:
  qemu-img snapshot -c is unreasonably slow

Status in QEMU:
  Fix Released

Bug description:
  Something fishy is going on with qcow2 internal snapshot creation
  times.  I don't know if this is a regression because I haven't used
  internal snapshots in the past.

  QEMU 1.4-rc2:
  $ qemu-img create -f qcow2 test.qcow2 -o size=50G,preallocation=metadata
  $ time qemu-img snapshot -c new test.qcow2
  real	3m39.147s
  user	0m10.748s
  sys	0m26.165s

  (This is on an SSD)

  I expect snapshot creation to take under 1 second.

To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/1126369/+subscriptions