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If interval is 2, and sum - prev[key] = 1, the result = 0. This will mislead the tester that the port has no traffic right now. So reduce the sampling interval to 1. Signed-off-by: Zhengchao Shao <shaozhengchao@huawei.com> Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Link: https://lore.kernel.org/bpf/20220419114746.291613-1-shaozhengchao@huawei.com