updated assumptions; enabled more optimizations by default

sysctl.conf

@@ -124,11 +124,11 @@ net.core.netdev_max_backlog = 250000
 net.core.bpf_jit_harden = 2
 
 # increase TCP max buffer size setable using setsockopt()
-#net.core.rmem_max = 8388608
-#net.core.wmem_max = 8388608
-#net.core.rmem_default = 8388608
-#net.core.wmem_default = 8388608
-#net.core.optmem_max = 8388608
+net.core.rmem_max = 8388608
+net.core.wmem_max = 8388608
+net.core.rmem_default = 8388608
+net.core.wmem_default = 8388608
+#net.core.optmem_max = 40960
 
 ########## IPv4 Networking ##########
 
@@ -218,6 +218,8 @@ net.ipv4.tcp_timestamps = 0
 # enabling SACK can increase the throughput
 # but SACK is commonly exploited and rarely used
 net.ipv4.tcp_sack = 0
+net.ipv4.tcp_dsack = 0
+net.ipv4.tcp_fack = 0
 
 # divide socket buffer evenly between TCP window size and application
 net.ipv4.tcp_adv_win_scale = 1
@@ -225,15 +227,15 @@ net.ipv4.tcp_adv_win_scale = 1
 # SSR could impact TCP's performance on a fixed-speed network (e.g., wired)
 #   but it could be helpful on a variable-speed network (e.g., LTE)
 # uncomment this if you are on a fixed-speed network
-#net.ipv4.tcp_slow_start_after_idle = 0
+net.ipv4.tcp_slow_start_after_idle = 0
 
 # enabling MTU probing helps mitigating PMTU blackhole issues
 # this may not be desirable on congested networks
-#net.ipv4.tcp_mtu_probing = 1
+net.ipv4.tcp_mtu_probing = 1
 
 # increase memory thresholds to prevent packet dropping
-#net.ipv4.tcp_rmem = 4096 87380 8388608
-#net.ipv4.tcp_wmem = 4096 87380 8388608
+net.ipv4.tcp_rmem = 4096 87380 8388608
+net.ipv4.tcp_wmem = 4096 87380 8388608
 
 ########## IPv6 Networking ##########