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+
+virsh snapshot-create too slow (kvm, qcow2, savevm)
+
+Action
+======
+# time virsh snapshot-create 1
+
+* Taking snapshot of a running KVM virtual machine
+
+Result
+======
+Domain snapshot 1300983161 created
+real    4m46.994s
+user    0m0.000s
+sys     0m0.010s
+
+Expected result
+===============
+* Snapshot taken after few seconds instead of minutes.
+
+Environment
+===========
+* Ubuntu Natty Narwhal upgraded from Lucid and Meerkat, fully updated.
+
+* Stock natty packages of libvirt and qemu installed (libvirt-bin 0.8.8-1ubuntu5; libvirt0 0.8.8-1ubuntu5; qemu-common 0.14.0+noroms-0ubuntu3; qemu-kvm 0.14.0+noroms-0ubuntu3).
+
+* Virtual machine disk format is qcow2 (debian 5 installed)
+image: /storage/debian.qcow2
+file format: qcow2
+virtual size: 10G (10737418240 bytes)
+disk size: 1.2G
+cluster_size: 65536
+Snapshot list:
+ID        TAG                 VM SIZE                DATE       VM CLOCK
+1         snap01                  48M 2011-03-24 09:46:33   00:00:58.899
+2         1300979368              58M 2011-03-24 11:09:28   00:01:03.589
+3         1300983161              57M 2011-03-24 12:12:41   00:00:51.905
+
+* qcow2 disk is stored on ext4 filesystem, without RAID or LVM or any special setup.
+
+* running guest VM takes about 40M RAM from inside, from outside 576M are given to that machine
+
+* host has fast dual-core pentium cpu with virtualization support, around 8G of RAM and 7200rpm harddrive (dd from urandom to file gives about 20M/s)
+
+* running processes: sshd, atd (empty), crond (empty), libvirtd, tmux, bash, rsyslogd, upstart-socket-bridge, udevd, dnsmasq, iotop (python)
+
+* networking is done by bridging and bonding
+
+
+Detail description
+==================
+
+* Under root, command 'virsh create-snapshot 1' is issued on booted and running KVM machine with debian inside.
+
+* After about four minutes, the process is done.
+
+* 'iotop' shows two 'kvm' processes reading/writing to disk. First one has IO around 1500 K/s, second one has around 400 K/s. That takes about three minutes. Then first process grabs about 3 M/s of IO and suddenly dissapears (1-2 sec). Then second process does about 7.5 M/s of IO for around a 1-2 minutes.
+
+* Snapshot is successfuly created and is usable for reverting or extracting.
+
+* Pretty much the same behaviour occurs when command 'savevm' is issued directly from qemu monitor, without using libvirf44bfb7fb978c9313ce050a1c4149bf04aa0a670t at all (actually, virsh snapshot-create just calls 'savevm' to the monitor socket).
+
+* This behaviour was observed on lucid, meerkat, natty and even with git version of libvirt (f44bfb7fb978c9313ce050a1c4149bf04aa0a670). Also slowsave packages from  https://bugs.launchpad.net/ubuntu/+source/libvirt/+bug/524447 gave this issue.
+
+
+Thank you for helping to solve this issue!
+
+ProblemType: Bug
+DistroRelease: Ubuntu 11.04
+Package: libvirt-bin 0.8.8-1ubuntu5
+ProcVersionSignature: Ubuntu 2.6.38-7.38-server 2.6.38
+Uname: Linux 2.6.38-7-server x86_64
+Architecture: amd64
+Date: Thu Mar 24 12:19:41 2011
+InstallationMedia: Ubuntu-Server 10.04.2 LTS "Lucid Lynx" - Release amd64 (20110211.1)
+ProcEnviron:
+ LANG=en_US.UTF-8
+ SHELL=/bin/bash
+SourcePackage: libvirt
+UpgradeStatus: No upgrade log present (probably fresh install)
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