Re: [lwip-users] very poor performance of httpd

[Tomasz W]

When I use TLS, I have low performance when my mbedTLS code was about
256KB in flash (GD32F107). GD32F107 to 256KB flash has 0 wait stat
flash, but abow this is slower.
WWW about 220KB are upload about 1.5s(TLS code below 256KB), when code
is about 256KB upload are about 11s.

pon., 17 sie 2020 o 16:29 Mário Luzeiro <mrluzeiro@ua.pt> napisał(a):
>
> Hi Felix,
>
> I had similar issues but using TLS
> https://lists.nongnu.org/archive/html/lwip-users/2020-05/msg00006.html
>
> I experience the same: some requests are very quick and others take seconds.
> ..but didn't found a solution yet.
>
> I will follow this thread in case someone comes with more suggestions.
>
> I suggest you can start trying to increase MEMP_NUM_TCP_PCB to the double
> I think play with smaller values in TCP_MSS and/or TCP_WND could help.. but 
> not sure...
>
> Mario
>
> ________________________________________
> From: lwip-users <lwip-users-bounces+mrluzeiro=ua.pt@nongnu.org> on behalf of 
> Felix Frey <frey@stettbacher.ch>
> Sent: 17 August 2020 14:40
> To: lwip-users@nongnu.org
> Subject: [lwip-users] very poor performance of httpd
>
> Hi,
>
> I've running an application on a STM32F429 using LwIP 2.0.3 and it's httpd.
> Basically it works fine, however the performance of the httpd is very poor.
>
> When the browser does a http request for a total of five files (statically 
> linked)
> with a total amount of 40kB, it takes about 5sec to complete the request.
> It seems like the httpd gets stalled.
> In the log I can see several of the entrys below:
> -----
> 00006.560: http_poll: pcb=0x2000d7b8 hs=0x2000db08 pcb_state=ESTABLISHED
> 00006.560: http_poll: try to send more data
> 00006.560: http_send: hs=0x2000db08 pcb=0x2000d7b8 left=22030
> 00006.560: Trying to send 0 bytes
> 00006.560: Sent 0 bytes
> 00006.560: send_data end.
> 00006.560: tcp_output
> -----
> This is repeated every 500ms for about 2sec until sending moves on.
> It looks like it simply doesn't anything during this time. Why??
>
> My memory settings are:
> #define MEM_LIBC_MALLOC 1
> #define MEMP_NUM_TCP_PCB 8
> #define MEMP_NUM_PBUF 32
> #define TCP_MSS 1460
> #define TCP_WND 2920
>
> I've already played with configuration settings, however, it didn't change a 
> lot.
> Can anybody explain this behaviour or even help to improve it?
>
> Thanks in advance.
> Felix
>
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