diff options
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/topics/userspace-tx-steering.rst | 13 |
1 files changed, 7 insertions, 6 deletions
diff --git a/Documentation/topics/userspace-tx-steering.rst b/Documentation/topics/userspace-tx-steering.rst index 16f066a8a..3f39eeadb 100644 --- a/Documentation/topics/userspace-tx-steering.rst +++ b/Documentation/topics/userspace-tx-steering.rst @@ -33,15 +33,16 @@ Thread mode This mode is automatically selected when the port's ``tx-steering`` option is set to ``thread`` or unset. -Depending on the port's number of Tx queues being greater or equal than the -number of PMD threads, static txq mapping or XPS will be used. +Thread mode enables static (1:1) thread-to-txq mapping when the number of Tx +queues is greater than number of PMD threads, and dynamic (N:1) mapping if +equal or lower. In this mode a single thread can not use more than 1 transmit +queue of a given port. This is the recommended mode for performance reasons if the number of Tx queues -is greater or equal to the number of PMD threads, because the Tx lock is not -acquired. +is greater than the number of PMD threads, because the Tx lock is not acquired. -If the number of Tx queues is greater than the number of threads, the remaining -Tx queues will not be used. +If the number of Tx queues is greater than the number of threads (including the +main thread), the remaining Tx queues will not be used. This mode is enabled by default. |