On 03/15/2010 04:27 AM, Avi Kivity wrote:
That's only beneficial if the cache is shared. Otherwise, you could
use the balloon to evict cache when memory is tight.
Shared cache is mostly a desktop thing where users run similar
workloads. For servers, it's much less likely. So a modified-guest
doesn't help a lot here.
Not really. In many cloud environments, there's a set of common images
that are instantiated on each node. Usually this is because you're
running a horizontally scalable application or because you're supporting
an ephemeral storage model.
In fact, with ephemeral storage, you typically want to use
cache=writeback since you aren't providing data guarantees across
shutdown/failure.
Regards,
Anthony Liguori
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