Re: [Qemu-discuss] Difference between commit and rebase

[lampahome]

>
> Generally, rebase is going to be slower because it reads some clusters
> and compares the old with the new backing file to see whether they are
> the same.  commit will not do that.  (OTOH, if there are many clusters
> in the old backing chain that happen to contain the same data as the new
> one, this will save space, because it won’t copy those clusters from the
> old backing chain.)
>
But commit also can use -b to choose base image, won't it compare the old
with the new base?