RE: [lwip-users] Minimizing TCP send delay with RAW api and multi-threading.

[Andrew Foster]

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:address@hidden 
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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