Route lookup with 1 core with a full view on Linux is on the order of 100ns. https://vincent.bernat.im/en/blog/2017-ipv4-route-lookup-linux#performance_1 https:

Route lookup with 1 core with a full view on Linux is on the order of 100ns. https://vincent.bernat.im/en/blog/2017-ipv4-route-lookup-linux#performance_1 https://vincent.bernat.im/en/blog/2017-ipv4-route-lookup-lin... Linux is able to handle about 5 Gbps of traffic of small packets (64 bytes) with one core. This gives a latency of 100ns to keep the pace. You need to find a Linux router 10000 time slower than this to get a 1ms latency.