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SubjectRe: [PATCH][RF C/T/D] Unmapped page cache control - via boot parameter
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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