On Tue, Feb 23, 2016 at 8:57 AM, <s...@onet.eu> wrote: > I published example pcap file under following link: > > https://www.dropbox.com/s/v8375ub16seyt1a/test7.pcap?dl=0 > > I hope it is possible to download it without creating dropbox account.
Thanks for the trace. It looks like for the first 0.8 seconds of the trace some non-TCP component on the receiving machine (app, CPU, CPU power-saving mechanisms, NIC, or NIC driver) is limiting throughput to 78Mbit/sec (e.g. the very first window of 10 packets is ACKed at that rate). Then the throughput increases to over 200 Mbit/sec. AFAICT it doesn't look like the TCP layer is doing anything wrong. I'd look for issues with those other components. It might help to report the receiver application, receiver CPU type, kernel version, NIC, and NIC driver. neal
