sendfile, splice and the zero-copy mindset
Stop bouncing bytes through userspace just to put a file on a socket.
Performance
Data-parallel training: gradient bucketing and overlap
Why DDP feels like magic until you look at the allreduce schedule.
Tuning TCP BBR and fq on a high-latency link
Switching off loss-based congestion control on a long-fat path, and the fq gotcha for UDP.
A first, honest look at io_uring
Two ring buffers, one syscall, and the mental model that finally made it click.