On Mon, 2013-06-10 at 19:10 +1000, Alexey Kardashevskiy wrote: > > I would prefer not to completely drop the patch since it saves bandwidth and > > resources. > > I would like migration to do what it should do - send pages no matter what, > this is exactly what migration is for. If there any many, many empty pages > (which I doubt to be a very often real life case), they could all merged in > big consecutive chunks and sent at the end of migration.
I tend to agree. The problem of sending empty pages is purely a problem of compression. If the current mechanism is deemed "not efficient enough" for in the case of having lots of zero-pages, then by all means invent a better packet format for more tightly representing them on the wire, but don't break things by not sending them at all. Cheers, Ben.
