Update pgsql_perf_tuning.md

pgsql_perf_tuning.md

@@ -1195,7 +1195,7 @@ net.ipv4.tcp_synack_retries=2
 net.ipv4.tcp_syncookies=1   # 开启SYN Cookies。当出现SYN等待队列溢出时，启用cookie来处理，可防范少量的SYN攻击
 net.ipv4.tcp_tw_recycle=1   # 开启TCP连接中TIME-WAIT套接字的快速回收
 net.ipv4.tcp_tw_reuse=1     # 开启重用。允许将TIME-WAIT套接字重新用于新的TCP连接
-net.ipv4.tcp_timestamps=0   # 减少time_wait
+net.ipv4.tcp_timestamps=1   # 减少time_wait
 net.ipv4.tcp_tw_timeout=3
 net.ipv4.ip_local_port_range = 9000 65535    # 本地自动分配的TCP UDP端口号范围
 net.core.rmem_max = 4194304   # The maximum receive socket buffer size in bytes