Re: [Qemu-devel] Trying to get fstrim / discard=unmap to work

[Paolo Bonzini]

Il 11/03/2014 21:00, Richard W.M. Jones ha scritto:
> However the
> fstrim is suspiciously fast, so there's no way it can be scanning the
> whole disk for deleted files.  I don't think fstrim does what it says
> in the man page.

fstrim definitely has some cache inside.  It may also have some bugs. 
But when it works, it's pretty good at making du-on-the-host almost the 
same as usage-in-the-guest.

Paolo