On 01/23/2015 06:48 AM, Dr. David Alan Gilbert wrote: > * Liang Li (liang.z...@intel.com) wrote: >> Add the qmp and hmp commands to tune the parameters used in live >> migration. > > If I understand correctly on the destination side we need to set the number of > decompression threads very early on an incoming migration - I'm not > clear how early that needs to be - especially if you're using fd: so it's > not waiting for a connect ? > > Eric: How would libvirt do that?
Libvirt does some handshaking before starting migration. The source would advertise that "I'm capable of threaded migration; and plan to use X send and Y receive threads"; the destination would either reply that threads are unsupported or set the receive thread count at that point, then the source would know if it can enable threads and set the send thread count, before letting migration start. I don't see any problems with the current design of starting things up. -- Eric Blake eblake redhat com +1-919-301-3266 Libvirt virtualization library http://libvirt.org
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