Re: [libvirt] [RFC] libvirt support multi-thread compression for live migration

On 06/04/2015 06:31 PM, Qiao,Liyong wrote: [It's hard to read replies that aren't visually distinct from the rest of the text; you'll notice that most posters on this list leave a blank line before and after any text they add, so that a scan of the left-most column can easily spot blanks as a key for where new content begins] No, I was asking whether libvirt's 'compress' flag should imply "all possible compression at once", or whether there are cases where xbzrle and multi-thread are independently useful and should not both be on at once. If it is safe to always use both, then we don't need a new flag, but I don't know if it is safe. The migration handshake is already set up to negotiate capabilities between source and destination, whether it takes one flag (turning on both compressions, or gracefully falling back to xbzrle alone) or two (one per compression type, and erroring out if a request is made for an unsupported compression). -- Eric Blake eblake redhat com +1-919-301-3266 Libvirt virtualization library http://libvirt.org