Re: [lwip-users] Delay in web page loading on v1.4.2

[Mário Luzeiro]

I had a similar issue with DMA and DeviceDrivers but it was on ST. The ST DMA 
driver was not flushing properly the data.

________________________________________
From: lwip-users <lwip-users-bounces+mrluzeiro=address@hidden> on behalf of 
Trampas Stern <address@hidden>
Sent: 28 October 2019 12:03
To: Mailing list for lwIP users
Subject: Re: [lwip-users] Delay in web page loading on v1.4.2

What processor are you using?

I had a problem with slow delay loading and found that the Atmel's example 
driver for the GMAC was using DMA to transfer data and then polling the SRAM 
DMA location to see when transfer was done. The issue was that if I turned the 
data cache on in the processor it would cache the SRAM data and then cause 
weird slow or non responsive behavior.   For the moment I have data cache off 
but will have to rewrite the drivers to use interrupts eventually.

Trampas

On Thu, Oct 24, 2019 at 3:08 PM vinu <address@hidden<mailto:address@hidden>> 
wrote:
Hi all,

I am having issue in loading web page using netconn APIs in LWIP v1.4.2 on
FreeRTOS.

Earlier the issue was not there when we where running the MCU at 12MHz
clock. But once we switched to 120MHz, we are noticing random page loading
issues.

After few days of debugging  the stack, we found that the messages are
actually received at the TCP layer, but not received by the application
layer.

We have found that the request reaches the point *TCP_EVENT_RECV(pcb,
recv_data, ERR_OK, err);* in file tcp_in.c (added debug prints and
confirmed) - PFA image_1.
 Sometimes the packet reaches netconn_recv mailbox after a delay and
sometimes the packets never reach. I'm attaching the wireshark capture of
this issue. See packet no 92. login_page_issue.pcapng
<http://lwip.100.n7.nabble.com/file/t2163/login_page_issue.pcapng>

<http://lwip.100.n7.nabble.com/file/t2163/Screenshot_%2828%29.png>

Please help.

regards,
Vinu






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