Linux Tech Enthusiast

Jul 2, 2026 · Fundamentals

Why 1000 Mbps Isn’t Just 125 MB/s: Understanding Network Overhead and MTU

Although a 1000 Mbps link theoretically carries 125 MB of data per second, protocol headers, Ethernet framing, MTU limits, and VLAN tags reduce the effective throughput, and using jumbo frames can raise efficiency from about 97.5 % to 99.6 %.