On 10/25/2011 03:05 PM, Anthony Liguori wrote:
On 10/25/2011 07:35 AM, Kevin Wolf wrote:
Am 24.10.2011 13:35, schrieb Paolo Bonzini:
On 10/24/2011 01:04 PM, Juan Quintela wrote:
Hi
Please send in any agenda items you are interested in covering.
- What's left to merge for 1.0.
I would still like to cache the default cache mode (probably to
cache=writeback). We don't allow guests to toggle WCE yet which Anthony
would have liked to see before doing the change. Is it a strict
requirement?
I don't see a way around it. If the default mode is cache=writeback,
then we're open to data corruption in any guest where barrier=0. With
guest togglable WCE, it ends up being a guest configuration issue so we
can more or less defer responsibility.
Do you think it's a good idea to change the default mode w/o guest WCE
toggle support? What's your view about older guests if we change the
default mode? What's your main motivation for wanting to change the
default mode?
I'd be much more open to changing the default mode to cache=none FWIW
since the risk of data loss there is much, much lower.
A bit related to this, it would be nice to mark a VM un-migratable if
cache!=none. Juan reports that currently it such VMs are exposed to data
integrity issues so we need to fail migrating them automatically.
Regards,
Anthony Liguori
Kevin
