Wednesday, January 13, 2010

MTU and Jumbo Frame enabling for better Gigabit

Some information I've assembled regarding enabling jumbo frames to get more bandwidth out of Gigabit Ethernet installations.

Regardless of OS

Update the network driver for your adapter and change its properties to enable any MTU or Jumbo Frame setting. There's a standard 14-byte offset that comes into play: driver settings may use that; the OS setting won't. Also make sure your switch can handle this: some may support it, but only at 4K or 9K frames.

Standard: 1500
Mix/Match older Realtek & Intel: 4K / 4074 / 4088
Mix/Match newer Realtek & Intel: 9K / 9000 / 9014
High-end Intel & switches allow 16K

Linux

ifconfig ADAPTER mtu #

2000 / XP / Server 2003

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\Interfaces\

Set MTU as Decimal; save as DWORD

Reference

Vista / Server 2008 / 7

netsh int ip set subinterface "ADAPTER" mtu=# store=persistent

Reference

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