On 13.12.2016 17:10, Jesper Dangaard Brouer wrote:
>> What is bad about RDMA is that it is a separate kernel subsystem.
>> What I would like to see is a deeper integration with the network
>> stack so that memory regions can be registred with a network socket
>> and work requests then can be submitted and processed that directly
>> read and write in these regions. The network stack should provide the
>> services that the hardware of the NIC does not suppport as usual.
>
> Interesting. So you even imagine sockets registering memory regions
> with the NIC. If we had a proper NIC HW filter API across the drivers,
> to register the steering rule (like ibv_create_flow), this would be
> doable, but we don't (DPDK actually have an interesting proposal[1])
On a side note, this is what windows does with RIO ("registered I/O").
Maybe you want to look at the API to get some ideas: allocating and
pinning down memory in user space and registering that with sockets to
get zero-copy IO.
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