12/19/2023 0 Comments Small ftp server for windows![]() ![]() Therefore the embedded system is sending one frame and waiting for an ack before sending the next (un-buffered TCP with low data rate). Therefore the throughput during the download is around 1460 bytes each 60.80ms and thus around 20kBytes/s. The PC acknowledges each packet after a delay of about 40ms (delayed acks - see "Nagel algorithm" for reason).Įach time there is a TCP ack the embedded system requires about 20.40ms to prepare and send the next packet of 1460 bytes. The embedded system takes 300ms to access the file and start downloading the data in packets of 1460 bytes. The embedded stack's TCP Rx windows size is 1460 bytes (although this is not relevant for a download). The MSS is 1460 and the PC's TCP Rx window size is 64k. Your PC (192.168.3.191) is establishing the data connection for the file download ("test.bin"). Therefore, again, it is not a define which specifies the the payload size that is to be used since it can only specify the maximum that you want to use "when it is allowed and when the actual TCP connection doesn't specifically request a smaller size".Ĭontact me by personal message or on the uTasker web site to discuss professional training, solutions to problems or rapid product development requirementsįor professionals searching for faster, problem-free Kinetis and i.MX RT 10xx developments the uTasker project holds the key: If the TCP peer negotiates smaller MSS in the TCP handshake it can also result in smaller TCP payload too. If IPv4 header options are used (for whatever reason) the payload will also go down,as it does when over IPv6. Both IPv4 and TCP headers are 20 bytes each (minimum) so the maximum TCP payload (over IPv4 and no IP options) is 1500 - 40 = 1460 bytes.Ĭhanging FTP buffer sizes will not cause larger frame payload than 1460 bytes since it is not allowed over Ethernet. ![]() This means that the maximum TCP payload (whether FTP or other higher layer protocol, is 1500 - IPv4 header size - TCP header size. FTP is above IP and TCP and on Ethernet the maximum payload is 1500 bytes (MTU). ![]()
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