On 17.06.2014 11:03, David Marchand wrote: > Hello all, > > 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. > > >> Unless someone steps up and maintains ivshmem, I think it should be >> deprecated and dropped from QEMU. > > Then I can maintain ivshmem for QEMU. > If this is ok, I will send a patch for MAINTAINERS file. > >
Just a +1 over here for the need of a guest to guest shared memory solution. There are several internal requirements for that, and I saw this discussion just about when starting to build on top of nahanni/ivshmem. In general what I'd like to see is for ivshmem (or any other guest-guest shared memory communication solution) to get consolidated into the QEMU codebase, and not having to pick and choose pieces from different repositories. vhost-user is interesting and welcome, however guest-host communication is not the use case I have over here at the moment. Ciao, Claudio
