Michael Tokarev wrote:
Somewhere between kvm-75 and kvm-78, the
mentioned commands has been slowed down
to insane levels. By "insane" I mean to
take about 10 minutes(!) to save/load a
128MB RAM/1GB HDD VM's state. It used
to require several seconds for much larger
VMs...
Here's a typical sequence of system calls
during savevm:
[snip strace]
As you see, it writes 2 bytes, llseeks to THE SAME
position, writes next 2 bytes and so on. This takes
HUGE amount of time, and can be done, in most cases,
in a single write without any seeks.
Is it just me or are savevm/loadvm/delvm really THAT
broken?
It's qcow2 that is broken, with the new default cache=writethrough.
Does cache=writeback speed things up?
This is probably block reference counts being updated. There were some
batching patches posted, but they have not been applied yet, and are
probably insufficient for savevm.
And since migration to disk has been removed too,
there's no way currently to save the VM state...
That's being restored.
--
error compiling committee.c: too many arguments to function
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