benchmark: add clear connections to secure-pair

adds clear connections to the secure-pair performance test to prove
that in some cases (when the sender send the data in small chunks)
clear connections perform worse than TLS connections

Also add a byte chunk size test to benchmark/net/net-pipe.js

Refs: nodejs#27970

PR-URL: nodejs#27971
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>

benchmark/net/net-pipe.js

@@ -6,7 +6,7 @@ const net = require('net');
 const PORT = common.PORT;
 
 const bench = common.createBenchmark(main, {
-  len: [64, 102400, 1024 * 1024 * 16],
+  len: [2, 64, 102400, 1024 * 1024 * 16],
   type: ['utf', 'asc', 'buf'],
   dur: [5],
 });

benchmark/tls/secure-pair.js

@@ -2,8 +2,8 @@
 const common = require('../common.js');
 const bench = common.createBenchmark(main, {
   dur: [5],
-  securing: ['SecurePair', 'TLSSocket'],
-  size: [2, 1024, 1024 * 1024]
+  securing: ['SecurePair', 'TLSSocket', 'clear'],
+  size: [2, 100, 1024, 1024 * 1024]
 });
 
 const fixtures = require('../../test/common/fixtures');
@@ -37,7 +37,8 @@ function main({ dur, size, securing }) {
         isServer: false,
         rejectUnauthorized: false,
       };
-      const conn = tls.connect(clientOptions, () => {
+      const network = securing === 'clear' ? net : tls;
+      const conn = network.connect(clientOptions, () => {
         setTimeout(() => {
           const mbits = (received * 8) / (1024 * 1024);
           bench.end(mbits);
@@ -69,6 +70,9 @@ function main({ dur, size, securing }) {
         case 'TLSSocket':
           secureTLSSocket(conn, client);
           break;
+        case 'clear':
+          conn.pipe(client);
+          break;
         default:
           throw new Error('Invalid securing method');
       }