[Top][All Lists]

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

[lwip-users] about lwIP performance

From: yueyue papa
Subject: [lwip-users] about lwIP performance
Date: Wed, 8 Jul 2009 22:58:37 +0800

Hi All,
Is there anyone have the average TCP response time for lwIP in GPRS enviroment?
I always meet the performance problem in lwIP+ PPP, and unable to clear where is the problem: CPU, GPRS Device or network  environement. Recently I update to 1.3.1 lwIP
Here are some tests I made:
Use different PPP device:  serial cable, CDMA device, BT SPP, the network performance become better, so CPU is not the problem for slow.
I create a DUN by our GPRS device, the TCP/IP performance is much better. Ping result: 800ms vs. 12xxms. Much faster TCP response time. GPRS network is not the problem for slow.
So I think the lwIP stack is the problem. But the most problem will be the paramters configuration.
Is there the sensitive paramters for quickent the TCP send and response.
Shorten the retransmit time, use TCP_NODELAY, quick ACK may help
I unable to known how to shorten the TCP retransmit time, and whether there is ACK delay.
Any suggestion is helpful.

reply via email to

[Prev in Thread] Current Thread [Next in Thread]