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Upstream is working on reintroducing flipping to netback:
http://lists.xen.org/archives/html/xen-devel/2012-01/msg00557.html
Presumably they will re-enable flipping in xen-netfront as well once the above effort is complete. We should make sure that a RHEL-7 xen domU still uses copying (at least in combination with a RHEL-5 dom0). There seem to be two possibilities: (a) change the host side to advertise lack of flipping support (ie. only copying available), (b) make the guest ask for copying per default.
Option (b) was chosen for the RHEL-4 and RHEL-5 domU. RHEL-6 xen-netfront doesn't support flipping at all. We could choose (b) for the RHEL-7 guest again (if by the time of final forking xen-netfront will have flipping enabled at all), or try to cover it once for all in the host (option (a)). The latter could cause more regressions FWIW, Paolo mentions problems with migration.
This BZ is filed for option (b).