No big difference. FreeBSD was 1/8 of Linux. (BTW, httpbeast is incredibly fast. 1M req/sec!)
Load test against httpbeast on Linux $ wrk --latency -t 16 -c 1024 http://13.112.244.135:8080/ Running 10s test @ http://13.112.244.135:8080/ 16 threads and 1024 connections Thread Stats Avg Stdev Max +/- Stdev Latency 0.94ms 3.27ms 210.96ms 99.60% Req/Sec 70.04k 4.72k 117.41k 88.28% Latency Distribution 50% 769.00us 75% 0.97ms 90% 1.22ms 99% 2.87ms 11235338 requests in 10.10s, 1.11GB read Socket errors: connect 19, read 0, write 0, timeout 0 Requests/sec: 1112420.06 Transfer/sec: 112.45MB Run Load test against httpbeast on FreeBSD $ wrk --latency -t 16 -c 1024 http://3.112.192.88:8080/ Running 10s test @ http://3.112.192.88:8080/ 16 threads and 1024 connections Thread Stats Avg Stdev Max +/- Stdev Latency 11.17ms 35.64ms 594.11ms 98.16% Req/Sec 8.85k 2.02k 44.48k 92.77% Latency Distribution 50% 7.16ms 75% 7.24ms 90% 7.33ms 99% 199.25ms 1413518 requests in 10.10s, 142.89MB read Socket errors: connect 19, read 154423, write 8091, timeout 0 Requests/sec: 139962.78 Transfer/sec: 14.15MB Run