fix(bin): enable pacing on client & server by default (#1753)

* fix(bin): enable pacing on server by default

Before #1724 `neqo-server` would always run
with `ConnectionParameters::pacing` `true`. `neqo-client` would provide a
command line flag `--pacing` which defaulted to `false`.

#1724 consolidated the `QuicParameters`
`struct` from `neqo-client` and `neqo-server`. Since both `neqo-client` and
`neqo-server` default to `pacing` `false`.

This commit restores the pre-#1724 behavior, i.e. `neqo-server` defaulting to
`pacing=true` and `neqo-client` defaulting to `pacing=false`.

(Note that you will have to provide a value to `--pacing` from now on. I.e.
`--pacing=true` or `--pacing=false` instead of just `--pacing`.)

* fix(bin): enable pacing by default and add optional --no-pacing

Before #1724 `neqo-server` would always run
with `ConnectionParameters::pacing` `true`. `neqo-client` would provide a
command line flag `--pacing` which defaulted to `false`.

#1724 consolidated the `QuicParameters`
`struct` from `neqo-client` and `neqo-server`. Since both `neqo-client` and
`neqo-server` default to `pacing` `false`.

This commit replaces the `--pacing` flag with `--no-pacing`. Pacing is enabled
by default on both `neqo-server` and `neqo-client`.

* Update test/upload_test.sh

* Update comment

neqo-bin/src/lib.rs

@@ -89,9 +89,9 @@ pub struct QuicParameters {
     /// The congestion controller to use.
     pub congestion_control: CongestionControlAlgorithm,
 
-    #[arg(long = "pacing")]
-    /// Whether pacing is enabled.
-    pub pacing: bool,
+    #[arg(long = "no-pacing")]
+    /// Whether to disable pacing.
+    pub no_pacing: bool,
 
     #[arg(name = "preferred-address-v4", long)]
     /// An IPv4 address for the server preferred address.
@@ -162,7 +162,7 @@ impl QuicParameters {
             .max_streams(StreamType::UniDi, self.max_streams_uni)
             .idle_timeout(Duration::from_secs(self.idle_timeout))
             .cc_algorithm(self.congestion_control)
-            .pacing(self.pacing);
+            .pacing(!self.no_pacing);
 
         if let Some(&first) = self.quic_version.first() {
             let all = if self.quic_version[1..].contains(&first) {

test/upload_test.sh

@@ -9,9 +9,10 @@ cc=cubic
 client="cargo run --release --bin neqo-client -- http://$server_address:$server_port/ --test upload --upload-size $upload_size --cc $cc"
 server="cargo run --release --bin neqo-server -- --db ../test-fixture/db $server_address:$server_port"
 server_pid=0
-pacing=true
-if [ "$pacing" = true ]; then
-    client="$client --pacing"
+no_pacing=false
+if [ "$no_pacing" = true ]; then
+    client="$client --no-pacing"
+    server="$server --no-pacing"
 fi
 
 # Define two indexed arrays to store network conditions