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Re: [lwip-users] recv ok.. send is super slow
From: |
Kieran Mansley |
Subject: |
Re: [lwip-users] recv ok.. send is super slow |
Date: |
Mon, 12 May 2008 14:24:08 +0100 |
On Sat, 2008-05-10 at 15:10 -0400, Rishi Khan wrote:
> I am trying to test the performance of the lwip stack between two
> linux machines. If the server is lwIP, the performance is on par with
> the linux IP stack. If the client is lwIP, it is super slow. It seems
> that lwIP only sends data after a long timeout (it does not seem tied
> to tcp_slow/fast_tmr). Also, in the linux/linux case, the CPU
> utilization goes way up, but in the lwip-to-linux, the CPU says low.
> Is there any easy way to change this behavior? Attached is a simple
> example code.
A short packet capture (e.g. using wireshark) in the slow case would be
helpful.
Kieran