bond: tx performance enhancement part deux

- Reduce per packet cost by buffering the output packet buffer indexes in the queue and
process the queue outside the packet processing loop.
- Move unnecessary variable initialization outside of the while loop.
- There is no need to save the old interface if tracing is not enabled.

Test result for 256 bytes packet comparison. Other packet size shows similar improvement.

With the patch
--------------
BondEthernet0-output             active              52836        13526016               0          1.71e1          256.00
BondEthernet0-tx                 active              52836        13526016               0          2.68e1          256.00
TenGigabitEthernet6/0/0-output   active              52836         6762896               0          9.17e0          127.99
TenGigabitEthernet6/0/0-tx       active              52836         6762896               0          6.97e1          127.99
TenGigabitEthernet6/0/1-output   active              52836         6763120               0          9.40e0          128.00
TenGigabitEthernet6/0/1-tx       active              52836         6763120               0          7.00e1          128.00
bond-input                       active              52836        13526016               0          1.76e1          256.00

Without the patch
-----------------
BondEthernet0-output             active              60858        15579648               0          1.73e1          256.00
BondEthernet0-tx                 active              60858        15579648               0          2.94e1          256.00
TenGigabitEthernet6/0/0-output   active              60858         7789626               0          9.29e0          127.99
TenGigabitEthernet6/0/0-tx       active              60858         7789626               0          7.01e1          127.99
TenGigabitEthernet6/0/1-output   active              60858         7790022               0          9.31e0          128.00
TenGigabitEthernet6/0/1-tx       active              60858         7790022               0          7.10e1          128.00
bond-input                       active              60858        15579648               0          1.77e1          256.00

Change-Id: Ib6d73a63ceeaa2f1397ceaf4c5391c57fd865b04
Signed-off-by: Steven <sluong@cisco.com>

0 files changed, 0 insertions, 0 deletions

path: root/src/vnet/fib/ip6_fib.h

.. _geneve_methodology:

Generic Network Virtualization Encapsulation
--------------------------------------------

GENEVE Prefix Bindings
^^^^^^^^^^^^^^^^^^^^^^

GENEVE prefix bindings should be representative to target applications, where
a packet flows of particular set of IPv4 addresses (L3 underlay network) is
routed via dedicated GENEVE interface by building an L2 overlay.

Private address ranges to be used in tests:

- East hosts ip address range: 10.0.1.0 - 10.127.255.255 (10.0/9 prefix)

  - Total of 2^23 - 256 (8 388 352) of usable IPv4 addresses
  - Usable in tests for up to 32 767 GENEVE tunnels (IPv4 underlay networks)

- West hosts ip address range: 10.128.1.0 - 10.255.255.255 (10.128/9 prefix)

  - Total of 2^23 - 256 (8 388 352) of usable IPv4 addresses
  - Usable in tests for up to 32 767 GENEVE tunnels (IPv4 underlay networks)

GENEVE Tunnel Scale
~~~~~~~~~~~~~~~~~~~

If N is a number of GENEVE tunnels (and IPv4 underlay networks) then TG sends
256 packet flows in every of N different sets:

- i = 1,2,3, ... N - GENEVE tunnel index

- East-West direction: GENEVE encapsulated packets

  - Outer IP header:

    - src ip: 1.1.1.1

    - dst ip: 1.1.1.2

  - GENEVE header:

    - vni: i

  - Inner IP header:

    - src_ip_range(i) = 10.(0 + rounddown(i/255)).(modulo(i/255)).(0-to-255)

    - dst_ip_range(i) = 10.(128 + rounddown(i/255)).(modulo(i/255)).(0-to-255)

- West-East direction: non-encapsulated packets

  - IP header:

    - src_ip_range(i) = 10.(128 + rounddown(i/255)).(modulo(i/255)).(0-to-255)

    - dst_ip_range(i) = 10.(0 + rounddown(i/255)).(modulo(i/255)).(0-to-255)

+----------------+-------------+
| geneve-tunnels | total-flows |
+================+=============+
|              1 |         256 |
+----------------+-------------+
|              4 |       1 024 |
+----------------+-------------+
|             16 |       4 096 |
+----------------+-------------+
|             64 |      16 384 |
+----------------+-------------+
|            256 |      65 536 |
+----------------+-------------+
|          1 024 |     262 144 |
+----------------+-------------+