Re: [Qemu-devel] Why I advise against using ivshmem

[David Marchand]

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.


--
David Marchand