The combination of checksum offload disabled (that causes software GSO) and a debug kernel is inherently slow. Depending on the CPU power and load, RTT may increase, limiting sk_pacing_rate, so tcp_tso_autosize caps SKBs at around 40 segments, and zero BIG TCP packets are produced. Increase sysctl net.ipv4.tcp_min_tso_segs and set a bigger initial value of CWND in these configurations to force BIG TCP. Fixes: 5cb53743e1ff ("selftests: net: Add a test for BIG TCP in UDP tunnels") Signed-off-by: Alice Mikityanska <alice@isovalent.com> Acked-by: Matthieu Baerts (NGI0) <matttbe@kernel.org> Link: https://patch.msgid.link/20260822120308.1165200-5-alice.kernel@fastmail.im Signed-off-by: Jakub Kicinski <kuba@kernel.org>