Am I assuming correct that you are using the raw api with your own
threading-mechanisms instead of using the netcon- or socekt API? If so,
you don't have to wait for your poll callback to be called: you can
always try to send more data from the sent- or recv- callback. And if
you need to to do something in an application thread then, use
tcpip_callback() to get back into tcpip_thread directly - no waiting for
poll necessary.
Simon
Andrew Foster wrote:
Kieran,
I apologize, I mixed some verbiage in my description. I'm asking how to
minimize the delay from application data being ready, to the start of a
new TCP transmission.
My understanding is that I cannot call a tcp_write from other threads. I
think that means that I would have to wait until the tcpip_thread polls
my application to initiate a tcp_write and tcp_output.
Maybe I'm going about this the wrong way. Could I just add a sys_timeout
to poll my application at a faster rate? This would ensure that the
tcp_write/output happens in context of the tcpip_thread.
Thanks,
Andrew
-----Original Message-----
From: Kieran Mansley [mailto:[email protected]]
Sent: Friday, November 12, 2010 04:11
To: Mailing list for lwIP users
Subject: Re: [lwip-users] Minimizing TCP send delay with RAW api and
multi-threading.
On Thu, 2010-11-11 at 15:49 -0500, Andrew Foster wrote:
Hello All,
Are there any safe tricks to get TCP data sent faster from a non
tcpip_thread? Since the RAW api is not safe for concurrent access, it
seems the delay will always be a factor of the tcp_tmr intervals
(fast&slow). With that in mind, the only way to reduce the delay is to
adjust these tmr values to get the TCP_EVENT_POLL to happen more
frequently.
I don't follow how the timer delays will affect the speed of data being
sent. The timers are only really involved in this path for
retransmissions.
Kieran
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