On Sat, 2012-03-24 at 16:30 +0100, Christoph Hellwig wrote: > On Wed, Mar 14, 2012 at 01:14:18PM +0100, Paolo Bonzini wrote: > > > > Note that the discard granularity is only a hint, so it's really more a > > maximum suggested value than a granularity. Outside of a cluster > > boundary the format would still have to write zeros manually. > > > > Also, Linux for example will only round the number of sectors down to > > the granularity, not the start sector. > > Which really is more of a bug than a feature. The current discard > implementation in Linux is still very poor.
The disk protocols do not require the granularity to be respected. It is *only a hint*. Therefore, QEMU has to handle non-aligned discards. It doesn't really matter what we wish was the case; this is the reality. -- Richard
signature.asc
Description: This is a digitally signed message part