On Sat, 2011-06-04 at 11:38 +0200, Ingo Molnar wrote: > * Sasha Levin <levinsasha928@xxxxxxxxx> wrote: > > > Coalescing MMIO allows us to avoid an exit every time we have a > > MMIO write, instead - MMIO writes are coalesced in a ring which > > can be flushed once an exit for a different reason is needed. > > A MMIO exit is also trigged once the ring is full. > > > > Coalesce all MMIO regions registered in the MMIO mapper. > > Add a coalescing handler under kvm_cpu. > > Does this have any effect on latency? I.e. does the guest side > guarantee that the pending queue will be flushed after a group of > updates have been done? Theres nothing that detects groups of MMIO writes, but the ring size is a bit less than PAGE_SIZE (half of it is overhead - rest is data) and we'll exit once the ring is full. -- Sasha. -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
