On 26.09.2016 12:01, Peter Krempa wrote:
On Mon, Sep 26, 2016 at 11:43:58 +0300, Nikolay Shirokovskiy wrote:
xml example:
<disk ...> <cachetune writeback='on' direct='off' no_flush='on'/>
Aren't writeback and direct mutually exclusive?
</disk>
What's wrong with
<disk ...> <driver ... cache=''>?
See https://libvirt.org/formatdomain.html#elementsDisks
This commit message really does not describe your motivation for the addition.
Sorry, I forget to write down the motivation. Internally qemu uses 3 orthogonal flags to configure disk cache. They are exposed in interface too quite long time ago (29c4e2b). All-in-one cache parameter that libvirt uses now do not provide all possible values (5 vs 8). For example absent combination of direct + no flush (no sync) is useful to speed up tests. So I decided to provide new possibilities just as qemu does - keep old parameter and use new ones to tune over.