Update tunnel_client.rs

Author: BuffOvrFlw

src/tunnel_client.rs

@@ -919,11 +919,14 @@ async fn fire_batch(
         )
         .await;
         let sid_short = &script_id[..script_id.len().min(8)];
+        let rtt = t0.elapsed();
+        f.h2_open_timeout.store((rtt.as_secs() * 4 + 1).clamp(8, 20), Ordering::SeqCst);
+
         tracing::info!(
             "batch: {} ops → {}, rtt={:?}",
             n_ops,
             sid_short,
-            t0.elapsed()
+            rtt
         );
 
         match result {