config: increase MaxPacketMsgPayloadSize to 1400

The MTU (Maximum Transmission Unit) for Ethernet is 1500 bytes.
The IP header and the TCP header take up 20 bytes each at least (unless
optional header fields are used) and thus the max for (non-Jumbo frame)
Ethernet is 1500 - 20 -20 = 1460
Source: https://stackoverflow.com/a/3074427/820520

config/config.go

@@ -561,15 +561,20 @@ func DefaultP2PConfig() *P2PConfig {
 		MaxNumOutboundPeers:          10,
 		PersistentPeersMaxDialPeriod: 0 * time.Second,
 		FlushThrottleTimeout:         100 * time.Millisecond,
-		MaxPacketMsgPayloadSize:      1024,    // 1 kB
-		SendRate:                     5120000, // 5 mB/s
-		RecvRate:                     5120000, // 5 mB/s
-		PexReactor:                   true,
-		SeedMode:                     false,
-		AllowDuplicateIP:             false,
-		HandshakeTimeout:             20 * time.Second,
-		DialTimeout:                  3 * time.Second,
-		TestDialFail:                 false,
+		// The MTU (Maximum Transmission Unit) for Ethernet is 1500 bytes.
+		// The IP header and the TCP header take up 20 bytes each at least (unless
+		// optional header fields are used) and thus the max for (non-Jumbo frame)
+		// Ethernet is 1500 - 20 -20 = 1460
+		// Source: https://stackoverflow.com/a/3074427/820520
+		MaxPacketMsgPayloadSize: 1400,
+		SendRate:                5120000, // 5 mB/s
+		RecvRate:                5120000, // 5 mB/s
+		PexReactor:              true,
+		SeedMode:                false,
+		AllowDuplicateIP:        false,
+		HandshakeTimeout:        20 * time.Second,
+		DialTimeout:             3 * time.Second,
+		TestDialFail:            false,
 	}
 }
 

p2p/conn/connection.go

@@ -25,7 +25,8 @@ import (
 )
 
 const (
-	defaultMaxPacketMsgPayloadSize = 1024
+	// mirrors MaxPacketMsgPayloadSize from config/config.go
+	defaultMaxPacketMsgPayloadSize = 1400
 
 	numBatchPacketMsgs = 10
 	minReadBufferSize  = 1024