On Wed, Jul 15, 2015 at 05:12:01PM +0200, Igor Mammedov wrote: > On Thu, 9 Jul 2015 13:47:17 +0200 > Igor Mammedov <imamm...@redhat.com> wrote: > > there also is yet another issue with vhost-user. It also has > very low limit on amount of memory regions (if I recall correctly 8) > and it's possible to trigger even without memory hotplug. > one just need to start QEMU with a several -numa memdev= options > to create a necessary amount of memory regions to trigger it. > > lowrisk option to fix it would be increasing limit in vhost-user > backend. > > another option is disabling vhost and fall-back to virtio, > but I don't know much about vhost if it's possible to > to switch it off without loosing packets guest was sending > at the moment and if it will work at all with vhost.
With vhost-user you can't fall back to virtio: it's not an accelerator, it's the backend. Updating the protocol to support a bigger table is possible but old remotes won't be able to support it. -- MST
