[dorlaor]

At Scylla we initially defined a new filesystem which adheres shard-per-core and thus a single physical hyperthread has the sole access to the data and thus there is no contention.

While it will be better than current XFS, we've made aio improvement to the later over the years and today it's good enough for ScyllaDB.

Practically, even though Scylla has its tcp/ip stack in userspace on top of DPDK, we learned over the years that it's ok to use the less efficient kernel tcp stack. Most of the overhead and the optimizations can still happen within the DB itself as long as it controls the memory, the cache and manages the networking queues