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Bill,
As we suspected based on this information, setting
the TF_NODELAY flag in the accept callback did not make a difference.
Apparently the problem is somewhere else in the stack but not sure where.
I tried both MSIE and FoxFire browsers, same results. I just can't figure
out why there is so much delay between the http_sent() functions. It
appears that this is somehow related to the lwip either not sending the
tcp_write()/tcp_output() immediately or not processing the response packets
quickly (or maybe a combination of both). At any rate it appears that
httpd module can only serve up one chunk of the file about every 200msec.
If you think of anything else please let me know.
Rick
----- Original Message -----
Sent: Friday, April 24, 2009 9:56
AM
Subject: RE: [lwip-users] httpd slow
response
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 havent seen an lwipopts method to
do this. Which httpd server? The one in lwIP contrib/apps
doesnt 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 doesnt 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?
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