Is Windows Phone or HTTP packet request being requested? Monitoring a request delay of 600 ms on a server on the same local network

Question

I am developing a Windows Phone application that communicates with a server on a home LAN via Wi-Fi, and I encountered a traffic jam: the average travel time for a tiny HTTP request inside the LAN is 600-800 ms.

This only happens with a standalone phone. If the phone is connected to a PC running Zune, the phone starts talking through Zune, and the response time drops from 600 ms to 20 ms (!).

I wrote a small replay program that sends an HTTP request every 100ms and starts a Wireshark trace. A trace indicates that the server is immediately responding. This is a telephone that delays requests and sends from three to five requests at the same time as a packet approximately once per second.

Additional Information:

My program uses HttpWebRequest, not WebClient. I tried to create threads for each request, no luck. This happens in the WP7 release and on Mango. The same thing, regardless of whether I am running away from work or at home Wifi. The low-level implementation using the socket API in Mango demonstrates the same behavior.

I saw other posts in the App Hub with the same problem. Please help clarify why this is happening.

Answer 1

Perhaps another experiment will help. Turn on your phone and use Wi-Fi to send messages. I suspect this batch is the result of battery saving function.

Answer 2

If I understand correctly, cellular channel layer protocols are explosive, so they can virtualize and run more connections than there are transponders. I suspect this is the root of your symptoms.