On Thu, 19 Nov 2020 13:23:43 -0800 Alexander Duyck wrote: > This patch set is meant to address issues seen with SYN/ACK packets not > containing the ECT0 bit when DCTCP is configured as the congestion control > algorithm for a TCP socket. > > A simple test using "tcpdump" and "test_progs -t bpf_tcp_ca" makes the > issue obvious. Looking at the packets will result in the SYN/ACK packet > with an ECT0 bit that does not match the other packets for the flow when > the congestion control agorithm is switch from the default. So for example > going from non-DCTCP to a DCTCP congestion control algorithm we will see > the SYN/ACK IPV6 header will not have ECT0 set while the other packets in > the flow will. Likewise if we switch from a default of DCTCP to cubic we > will see the ECT0 bit set in the SYN/ACK while the other packets in the > flow will not. Applied, thanks!
