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| -rw-r--r-- | docs/testing/user/userguide/faq.rst | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/docs/testing/user/userguide/faq.rst b/docs/testing/user/userguide/faq.rst index 9a1a7da..a8aad9a 100644 --- a/docs/testing/user/userguide/faq.rst +++ b/docs/testing/user/userguide/faq.rst @@ -47,3 +47,49 @@ The most common issues that prevent traffic from passing are: - if the switch port is configured as access port, you must disable vlan_tagging in the NFVbench configuration - of the switch port is configured as trunk (recommended method), you must enable it + +Issues with high performances at a high line rate +------------------------------------------------- + +Flow statistics and/or latency stream can cause performance issue when testing high line rate. + +Flow statistics implies CPU usage to analyse packets and retrieve statistics. CPU can reach 100% usage when high throughput is tested because only one CPU is used for packet reception in TRex. +The ``--no-flow-stats`` option allows you to disable TRex statistics aggregation during the NFVBench test. +This, will permit to save CPU capabilities used for packet reception. + +Example of use : + +.. code-block:: bash + + nfvbench ``--no-flow-stats`` + + 2019-10-28 10:26:52,099 INFO End-to-end connectivity established + 2019-10-28 10:26:52,127 INFO Cleared all existing streams + 2019-10-28 10:26:52,129 INFO Traffic flow statistics are disabled. + + +Latency streams implies also CPU usage to analyse packets and retrieve latency values. CPU can reach 100% usage when high throughput is tested because only one CPU is used for packet reception in TRex. +The ``--no-latency-streams`` option allows you to disable latency streams during the NFVBench test. +This, will permit to save CPU capabilities used for packet reception but no latency information will be return (to be used only if latency value has no meaning for your test). + +Example of use : + +.. code-block:: bash + + nfvbench ``--no-latency-streams`` + 2019-10-28 10:30:03,955 INFO End-to-end connectivity established + 2019-10-28 10:30:03,982 INFO Cleared all existing streams + 2019-10-28 10:30:03,982 INFO Latency streams are disabled + + +Latency flow statistics implies CPU usage to analyse packets and retrieve statistics. CPU can reach 100% usage when high throughput is tested because only one CPU is used for packet reception in TRex. +The ``--no-latency-stats`` option allows you to disable TRex statistics aggregation for latency packets during the NFVBench test. +This, will permit to save CPU capabilities used for packet reception. + +Example of use : + +.. code-block:: bash + + nfvbench ``--no-latency-stats`` + 2019-10-28 10:28:21,559 INFO Cleared all existing streams + 2019-10-28 10:28:21,567 INFO Latency flow statistics are disabled. |