kernelconfig_penguin
default or selected kernelversion does not have config value CONFIG_2BUFF_MODE.
Result is shown for kernelversion 2.6.12.6

Use 2 Buffer Mode on Rx side.

configname: CONFIG_2BUFF_MODE

Linux Kernel Configuration
└─> Networking support
└─> Ethernet (10000 Mbit)
└─> Use 2 Buffer Mode on Rx side.

On enabling the 2 buffer mode, the received frame will be
split into 2 parts before being DMA'ed to the hosts memory.
The parts are the ethernet header and ethernet payload.
This is useful on systems where DMA'ing to to unaligned
physical memory loactions comes with a heavy price.
If not sure please say N.