TestBot news

[Francois Gouget]

On Sun, 4 Dec 2016, Jonas Maebe wrote:

> Francois Gouget wrote:
> > Indeed during the revert vm1 shows no read traffic (lots of RAM to cache 
> > that), but a steady 6 MB/s stream of writes ! In contrast on vm2 writes 
> > quickly ramp up to 80 MB/s, then stop after ~5 seconds and QEMU just 
> > uses CPU for the last ~4 seconds.
> 
> Maybe vm2 mounts its file systems with noatime?

The VM hosts all use relatime which provides essentially all the 
benefits of noatime.

But in this case I expect the writes all go to the qcow2 disk image and 
I know vm1 is capable of sustaining more than 6 MB/s writes (e.g. when 
copying >100 GB around).


-- 
Francois Gouget <fgouget at codeweavers.com>