> When I try with tw_recycle = 0 then I start to get a lot of TIME_WAIT > connections and performance degrades quite quickly so I cannot remove it > for now
This indicates you are running out of source ports and it is probably why the latency increases with the number of simultaneous connections. Can you please: - check dmesg for kernel errors/warnings while benchmarking - run vmstat 1 while benchmarking and post the result - specify the exact version and build config (haproxy -vv) - specify exact linux kernel release (uname -a) I'm not sure if it helps in your environment, but could you try the "option nolinger" in the backend? Lukas
