Nice article. I'm in the process of absorbing it. Question:

> scylla-rust-driver issued at least 1 syscall per query, which might be the source of elevated latency – and with a super-fast network (of which loopback is a prime example) it also means that throughput suffers – a latency of 1ms means that we won’t be able to send more than 1000 requests per second.

Is 1 ms measured? Buffering and reducing syscalls is good, but still: that seems horribly slow for a small or EWOULDBLOCK-returning read/write. Why would it be that bad?