Enable 4W TX bursts (optional)


Linux Kernel Configuration
└─>Device Drivers
└─>Network device support
└─>ATM drivers
└─>Enable 4W TX bursts (optional)
In linux kernel since version 2.6.12  
Burst four words at once in the send direction. You may want to try
this if you have disabled 8W bursts. Enabling 4W if 8W is also set
may or may not improve throughput.