On 01/10/2015 11:22, Avi Kivity wrote: >> As far as I could see, without this kind of motivation, people do not >> even want to try. > > You are mistaken. The problem is a lot harder than you think. > > People didn't go and write userspace drivers because they were lazy. > They wrote them because there was no other way.
I disagree, it is possible to write a 'partial' userspace driver. Here it is an example: http://dpdk.org/browse/dpdk/tree/drivers/net/mlx4 It benefits of the kernel's capabilities while the userland manages only the IOs. There were some tentative to get it for other (older) drivers, named 'bifurcated drivers', but it is stalled. best regards, Vincent
