"Wang, Wei W" <wei.w.w...@intel.com> writes: > On Saturday, January 21, 2017 12:38 AM, Jan Kiszka wrote: >> On 2017-01-20 12:54, Wang, Wei W wrote: >>> Having a theoretical analysis on the performance: The traditional >>> shared memory mechanism, sharing an intermediate memory, requires 2 >>> copies to get the packet transmitted. It's not just one more copy >>> compared to the 1-copy solution, I think some more things we may >>> need to take into account: >> >> 1-copy (+potential transfers to userspace, but that's the same for >> everyone) is conceptually possible, definitely under stacks like >> DPDK. However, Linux skbs are currently not prepared for picking up >> shmem-backed packets, we already looked into this. Likely >> addressable, though. > > Not sure how difficult it would be to get that change upstream-ed to > the kernel, but looking forward to seeing your solutions.
The problem is that the shared memory mapping doesn't have a struct page as required by lots of networking code. -- Måns Rullgård
