Ok. Than as Simon pointed out – the tcp_output avoids Nagle. I
followed the contrib/apps httpd example and without tcp_output calls I needed
TF_NODELAY.
Which is right? I would hope that an lwIP contrib example would
show the correct way to implement something.
Bill
From:
address@hidden
[mailto:address@hidden On Behalf
Of Rick Culver
Sent: Friday, April 24, 2009 10:08 AM
To: Bill Auerbach; 'Mailing list for lwIP users'
Subject: Re: [lwip-users] httpd slow response
Bill,
I will try this in the accept call back and advise the results. The
httpd.c module we are using is one that was supplied by Luminary Micro with
their function library. It was modified from the one provided
in contrib/apps to include some SSI functionality (which we have
disabled). Basically the "send_data" function includes a call
to tcp_output() just before the final return if any data was sent.
-----
Original Message -----
Sent: Friday, April 24,
2009 7:41 AM
Subject: RE: [lwip-users]
httpd slow response
Rick,
I did this in the accept callback. I haven’t seen an
lwipopts method to do this. Which httpd server? The one in lwIP
contrib/apps doesn’t have the tcp_output you mention.
Bill.
From: address@hidden
[mailto:address@hidden On Behalf
Of Rick Culver
Sent: Friday, April 24, 2009 8:23 AM
To: Bill Auerbach; 'Mailing list for lwIP users'
Subject: Re: [lwip-users] httpd slow response
Thanks
for the prompt response. That would make sense to me. Where/how
would I include this in the code? Do you know if there is a way to change
this in the lwipopt.h file? I do see that the httpd server does include
the tcp_output() function write after a tcp_write(), would that not negate the
nagle delay anyway? What do you think?
-----
Original Message -----
Sent: Thursday, April 23,
2009 5:07 PM
Subject: RE: [lwip-users]
httpd slow response
Raw API doesn’t disable Nagle. I found things to be faster
if I do so:
pcb->flags |=
TF_NODELAY;
// Disable
Nagle
Bill
From: address@hidden
[mailto:address@hidden On Behalf
Of Rick Culver
Sent: Thursday, April 23, 2009 4:05 PM
To: address@hidden
Subject: [lwip-users] httpd slow response
I
am using lwip with raw API and the httpd web server. I noticed that when
serving up larger files that the response seemed extremely slow. The
http_sent() callback is used to send each new chunk of the file being served
and I discovered that it is taking about 175msec between the http_sent()
callbacks. What could be causing this huge delay in response? Any
ideas would could be wrong and/or how we can speed up this otherwise slow
server?
|