[diegocg]

There is nothing that user space solutions do that can not be implemented in kernel space. From what I understand, the Linux kernel networking stack is not optimised to process packets in bulk, which is the only way to deal with high speeds nics https://lwn.net/Articles/629155/

[uluyol]

True, but we have a kernel networking stack with a certain interface and a rich feature set. The kernel cannot break that API.

In contrast, a new userspace stack doesn't need to worry about backwards compatibility or supporting every use case.

So yes, the kernel can do just as good, but it's harder.

[miltondts]

This is probably the only way to have fast software in today's hardware.

Unfortunately the popular languages are all about single element at a time, and pointer chasing with the compiler having a hard time vectorizing operations and reorganizing data structures. I think most compilers don't/can't even do this because there are not enough guarantees. The only systems that actually do this are DBMSs.

[MaxBarraclough]

> compiler having a hard time vectorizing operations and reorganizing data structures

Reminds me of a recent blog post on exactly this topic. Apparently the Jai language might make some progress on this point.

• https://blog.royalsloth.eu/posts/the-compiler-will-optimize-...

• Discussion: https://news.ycombinator.com/item?id=27010965