fix(perf): increase maximum udp send buffer size (#254)

Previously only the maximum udp **receive** buffer size was increased to
`2500000` bytes. With this commit both the send and the receive buffer size is increase.

perf/terraform/configs/remote/.terraform.lock.hcl

@@ -5,6 +5,7 @@ provider "registry.terraform.io/hashicorp/archive" {
   version = "2.3.0"
   hashes = [
     "h1:NaDbOqAcA9d8DiAS5/6+5smXwN3/+twJGb3QRiz6pNw=",
+    "h1:OmE1tPjiST8iQp6fC0N3Xzur+q2RvgvD7Lz0TpKSRBw=",
     "zh:0869128d13abe12b297b0cd13b8767f10d6bf047f5afc4215615aabc39c2eb4f",
     "zh:481ed837d63ba3aa45dd8736da83e911e3509dee0e7961bf5c00ed2644f807b3",
     "zh:78d5eefdd9e494defcb3c68d282b8f96630502cac21d1ea161f53cfe9bb483b3",
@@ -25,6 +26,7 @@ provider "registry.terraform.io/hashicorp/aws" {
   constraints = "4.67.0"
   hashes = [
     "h1:5Zfo3GfRSWBaXs4TGQNOflr1XaYj6pRnVJLX5VAjFX4=",
+    "h1:dCRc4GqsyfqHEMjgtlM1EympBcgTmcTkWaJmtd91+KA=",
     "zh:0843017ecc24385f2b45f2c5fce79dc25b258e50d516877b3affee3bef34f060",
     "zh:19876066cfa60de91834ec569a6448dab8c2518b8a71b5ca870b2444febddac6",
     "zh:24995686b2ad88c1ffaa242e36eee791fc6070e6144f418048c4ce24d0ba5183",

perf/terraform/modules/long_lived/files/user-data.sh

@@ -6,6 +6,7 @@ sudo yum -y install iperf3
 
 # Bump UDP receive buffer size. See https://github.com/quic-go/quic-go/wiki/UDP-Receive-Buffer-Size.
 sudo sysctl -w net.core.rmem_max=2500000
+sudo sysctl -w net.core.wmem_max=2500000
 
 # Set maximum TCP send and receive window to bandwidth-delay-product.
 #

perf/terraform/modules/short_lived/main.tf

@@ -19,7 +19,7 @@ resource "aws_instance" "perf" {
 
   launch_template {
     name = "perf-node"
-    version = "3"
+    version = "4"
   }
 
   key_name = aws_key_pair.perf.key_name