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Chapter 20. Server Performance > Use the Same TCP MTU as Your ISP

20.11. Use the Same TCP MTU as Your ISP

If you're talking in the same size packets as your ISP, there will be less time spent splitting up packets or putting them back together.

The maximum IP packet size is 64KB, so most HTTP transfers could fit easily in a single packet, given that the average HTTP transfer is 10KB. This does not mean that only one packet gets sent per request or reply; the TCP setup and teardown are complex and requires multiple packet exchanges. In addition, most web servers use Ethernet connections to their router. Ethernet has a frame size limit of 1500 bytes, forcing larger IP packets to be broken up into 1500-byte fragments.


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