Restart snowflake-server on snowflake-01 with num-turbotunnel=4
We are hitting a performance ceiling at about 475 MiB/s TX. The CPUs are not fully saturated: they are averaging about 87%. Currently we have
num-turbotunnel=2. I want to try increasing this to
num-turbotunnel=4 to see if the KCP state machines are again a bottleneck.