On Wed, 30 Jul 2014, Machine Man wrote:
The problem was making a copy of a large file inside the VM (duplicating the
file in the VM)It was very slow and
it looks like it is the ide device.
Changed the controller to virtio and it is much faster.
I tried using an image file for this disk, but this was slower than pointing to
zvol on ide. I will test with
the controller set to virtio and file img for disk.
Overall,it is not bad now and the virtual machine is much more usable when
making large copies, still seems slow
from what I would expect. Copy start off at 120MB/s and quickly drops down to
14MB/s and then jumps up and down
to about 30 or 40 a few times, but no longer stalls as before.
What operating system do you have installed in your virtual machine
and what filesystem are you using? Is the backing zfs volume
blocksize properly matched with the blocksize of the virtual machine's
blocksize? If the blocksize and offsets are not well matched, then
performance would suffer quite a lot.
The VM writes to the zfs volume would normally be synchronous writes
(does not return util data is on disk), which will be slow unless you
have added a zfs slog (perhaps with an SSD) to make synchronous writes
faster.
Bob
--
Bob Friesenhahn
[email protected], http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer, http://www.GraphicsMagick.org/
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