Re: [lwip-users] LWIP slow web server only with Windows OS request

[Marco Giammarini]

Dear All, 

I’m studying this problem more in-depth (with Wireshark), and I found that sometimes Windows reply with ACK after 40ms at every packet. In this case, with a file of 800kB, a packet of 1460B, we have more or less 500 packets, that multiplied for 40ms reach 20 seconds each file.

I found that this problem is very common for Windows PC:

*  https://developpaper.com/lets-talk-about-the-magical-40-ms-of-tcp/

* https://docs.microsoft.com/it-it/troubleshoot/windows-server/networking/registry-entry-control-tcp-acknowledgment-behavior

Is there any way to solve the problem (or a workaround) by modify some parameters of lwIP?

Thanks

Marco