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herrala
2016 Mar 04
0
Re: Why are virsh vol-upload/vol-download so slow?
.../myimage.qcow2
>
> What is up with that?
What version of libvirt ? We had an unfortunate implementation mistake
which caused us to waste tonnes of time in memmove(). versions since
1.2.19 have a fix that addresses it
commit d9c9e138f22c48626f719f880920e04c639e0177
Author: Ossi Herrala <oherrala@gmail.com>
Date: Mon Jul 20 12:44:32 2015 +0000
rpc: Fix slow volume download (virsh vol-download)
Use I/O vector (iovec) instead of one huge memory buffer as suggested
in https://bugzilla.redhat.com/show_bug.cgi?id=1026137#c7. This avoids
doing memmove() to big buffers a...
2016 Mar 04
2
Why are virsh vol-upload/vol-download so slow?
I was interested in using 'virsh vol-upload' and 'virsh vol-download',
rather than mucking about directly with the filesystem. But while
simply copying the image is relatively quick:
# ls -l /var/lib/libvirt/images/centos-7-cloud.qcow2
-rw-r--r--. 1 qemu qemu 1004994560 Apr 15 2015 centos-7-cloud.qcow2
# time cp /var/lib/libvirt/images/centos-7-cloud.qcow2