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Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Simon Horman , Shuah Khan , linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH net] selftests: net: big_tcp_tunnels: Fix the IPv6 route change Message-ID: References: <20261007014731.1277055-1-yanhaishuang@cmss.chinamobile.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20261007014731.1277055-1-yanhaishuang@cmss.chinamobile.com> On Wed, Oct 07, 2026 at 09:47:31AM +0800, Haishuang Yan wrote: > On slow machines, do_test() raises initcwnd on the route into the tunnel > with "ip route change". For IPv6 traffic this fails with: > > RTNETLINK answers: No such file or directory > > The IPv6 prefix route of the tunnel address has metric 256, while > "ip -6 route change" without a metric looks for a route with the default > metric 1024, so nothing is changed. The test still passes, but without > the larger initcwnd it is meant to use. > > Pass the metric of the prefix route. > > Fixes: 1d62b83fb751 ("selftests: net: Fix slow configurations in big_tcp_tunnels.sh") > Signed-off-by: Haishuang Yan > --- > tools/testing/selftests/net/big_tcp_tunnels.sh | 3 ++- > 1 file changed, 2 insertions(+), 1 deletion(-) Reviewed-by: Narcisa Vasile