On Tue, Jun 17, 2014 at 11:03:32AM +0200, David Marchand wrote: > On 06/17/2014 04:54 AM, Stefan Hajnoczi wrote: > >ivshmem has a performance disadvantage for guest-to-host > >communication. Since the shared memory is exposed as PCI BARs, the > >guest has to memcpy into the shared memory. > > > >vhost-user can access guest memory directly and avoid the copy inside the guest. > > Actually, you can avoid this memory copy using frameworks like DPDK. I guess it's careful to allocate all packets in the mmapped BAR? That's fine if you can modify applications but doesn't work for unmodified applications using regular networking APIs. Stefan
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