Fix: 1-connection failures and improve benchmark speed

- Fixed port conflict: FASTSYNC_PORT changed from 19399 to 19410
  (19399+1=19400 conflicted with RSYNC_PORT=19400 on 1-connection runs)
- Reduced defaults: DATA_SIZE_MB 100->50, RUN_COUNT 3->1 (faster benchmarks)
- Improved wait times: data-size-aware, much longer for 1 connection
- Increased timeout: 300s -> 600s for client
- Better server startup: sleep 1 (was 0.5s)
- Better sync: sleep 2 after sync (was sleep 1 + sync + sleep 1)

Generated by Mistral Vibe.
Co-Authored-By: Mistral Vibe <vibe@mistral.ai>

benchmark_network.sh

@@ -25,8 +25,8 @@
 set -euo pipefail
 
 # ── Defaults ──────────────────────────────────────────────────────────────
-DATA_SIZE_MB=${2:-100}
+DATA_SIZE_MB=${2:-50}
-RUN_COUNT=${3:-3}
+RUN_COUNT=${3:-1}
 SCENARIO="${1:---lan}"
 
 # ── Parse scenario ────────────────────────────────────────────────────────
@@ -59,7 +59,7 @@ case "$SCENARIO" in
 esac
 
 # ── Ports ────────────────────────────────────────────────────────────────
-FASTSYNC_PORT=19399
+FASTSYNC_PORT=19410
 RSYNC_PORT=19400
 HOST="127.0.0.1"
 
@@ -227,28 +227,27 @@ run_fastsync() {
     
     "$SERVER_BIN" -p "$port" -d "$dst" >/dev/null 2>&1 &
     local spid=$!
-    sleep 0.5
+    sleep 1
     
     local output
-    output=$(timeout 300 "$CLIENT_BIN" -h "$HOST" -p "$port" -s "$SRC_DIR" -n "$nconn" 2>&1) || true
+    output=$(timeout 600 "$CLIENT_BIN" -h "$HOST" -p "$port" -s "$SRC_DIR" -n "$nconn" 2>&1) || true
     
     # With network latency, wait for all data to be written and synced to disk
-    # Base wait: proportional to latency (round-trip * 2 for safety margin)
+    # For 1 connection: much more time needed as data is sequential
-    # Connection factor: more connections = faster transfer = less extra wait needed
+    # For high latency: extra margin for TCP retransmissions and jitter
-    # 1 connection needs more time as data is sent sequentially
+    local wait_time=5
-    local base_wait=$(( LATENCY_MS / 10 ))
+    if [ "$nconn" -eq 1 ]; then
-    [ "$base_wait" -lt 2 ] && base_wait=2
+        wait_time=$(( 15 + LATENCY_MS / 5 + (DATA_SIZE_MB / 20) ))
-    local conn_factor=$(( 10 / nconn ))
+    else
-    local wait_time=$(( base_wait + conn_factor + 3 ))
+        wait_time=$(( 5 + LATENCY_MS / 10 + (DATA_SIZE_MB / 50) ))
-    [ "$wait_time" -lt 5 ] && wait_time=5
+    fi
-    [ "$nconn" -eq 1 ] && wait_time=$(( wait_time + LATENCY_MS / 20 + 3 ))
+    [ "$wait_time" -lt 10 ] && wait_time=10
     
     sleep $wait_time
     kill "$spid" 2>/dev/null || true
     wait "$spid" 2>/dev/null || true
     sync
-    sleep 1
+    sleep 2
-    sync
     
     local ms=$(echo "$output" | grep -oP 'ms=\K[0-9.]+' || echo "0")
     local mbs=$(echo "$output" | grep -oP 'throughput_mbs=\K[0-9.]+' || echo "0")