README.DNA_Libzero

Migrating from DNA to ZC
------------------------

DNA/Libzero have been replaced by PF_RING ZC that includes a superset of both technologies.
We have decided to allow you to migrate your existing DNA/libzero licenses to ZC at no cost.
All ypu have to do it so go to http://www.nmon.net/dnatozc/ and specify the MAC address for
which an existing DNA license has been created and you will receive an equivalent ZC license.

Introduction
------------

With DNA you can dramatically increase the packet capture and transmission speed as the 
kernel layer is bypassed and applications can communicate directly with drivers.

LibZero is a library that sits onto of DNA that implements several operations in zero
copy over DNA.

In order to exploit DNA, you need a DNA driver. Three driver families are currently 
available:

1 Gbit
- e1000e (RX and TX)
- igb    (RX and TX)

10 Gbit
- ixgbe (RX and TX)

These drivers can be found in drivers/DNA. Please refer to drivers/DNA/README.DNA 
for additional information about this matter.

With these drivers you can achieve wire rate at any packet size. You can test RX
using the pfcount application, and TX using the pfsend application.

Migrating from DNA/LibZero to ZC
--------------------------------
Please refer to README.MIGRATE_DNA_to_ZC

IMPORTANT
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Note that in case of TX, the transmission speed is limited by the RX performance. This is 
because when the receiver cannot keep-up with the capture speed, the ethernet NIC sends
ethernet PAUSE frames back to the sender to slow it down. If you want to ignore these frames
and thus send at full speed, you need to disable autonegotiation and ignore them
(ethtool -A eth? autoneg off rx off tx off).

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2003-14 - ntop.org