On 09/25/2015 07:41 AM, Alberto Garcia wrote: > Disabling I/O limits from a BDS also drains all pending throttled > requests, so it should be done at the beginning of bdrv_close() with > the rest of the bdrv_drain() calls before the BlockDriver is closed.
Can this be abused? If I have a guest running in a cloud where the cloud provider has put severe throttling limits on me, but lets me hotplug to my heart's content, couldn't I just repeatedly plug/unplug the disk to get around the throttling (every time I unplug, all writes flush at full speed, then I immediately replug to start batching up a new set of writes). In other words, shouldn't the draining still be throttled, to prevent my abuse? -- Eric Blake eblake redhat com +1-919-301-3266 Libvirt virtualization library http://libvirt.org
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