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author | Viacheslav Ovsiienko <viacheslavo@mellanox.com> | 2019-08-08 11:47:23 +0000 |
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committer | Thomas Monjalon <thomas@monjalon.net> | 2019-08-08 16:53:49 +0200 |
commit | 3a418d1d3d8561c1de4bfc7c05fc4c975aa1a0b1 (patch) | |
tree | ebac75a5f0ddee861cf8738f9f14128b7e995ea4 /doc/guides/nics/mlx5.rst | |
parent | e98e44bace69ebd28ac4c723c33c2c0985fb0c76 (diff) | |
download | dpdk-3a418d1d3d8561c1de4bfc7c05fc4c975aa1a0b1.zip dpdk-3a418d1d3d8561c1de4bfc7c05fc4c975aa1a0b1.tar.gz dpdk-3a418d1d3d8561c1de4bfc7c05fc4c975aa1a0b1.tar.xz |
doc: add limitation with mlx5 Tx inline settings
Introduces the possible limitations on maximal Tx queue
size in descriptors if Tx inline data are enabled.
Signed-off-by: Viacheslav Ovsiienko <viacheslavo@mellanox.com>
Diffstat (limited to 'doc/guides/nics/mlx5.rst')
-rw-r--r-- | doc/guides/nics/mlx5.rst | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/doc/guides/nics/mlx5.rst b/doc/guides/nics/mlx5.rst index d6082ac..4115520 100644 --- a/doc/guides/nics/mlx5.rst +++ b/doc/guides/nics/mlx5.rst @@ -162,6 +162,12 @@ Limitations To receive IPv6 Multicast messages on VM, explicitly set the relevant MAC address using rte_eth_dev_mac_addr_add() API. +- The amount of descriptors in Tx queue may be limited by data inline settings. + Inline data require the more descriptor building blocks and overall block + amount may exceed the hardware supported limits. The application should + reduce the requested Tx size or adjust data inline settings with + ``txq_inline_max`` and ``txq_inline_mpw`` devargs keys. + - E-Switch decapsulation Flow: - can be applied to PF port only. @@ -400,6 +406,10 @@ Run-time configuration option should be used with care, as it may lower performance when back pressure is not expected. + If inline data are enabled it may affect the maximal size of Tx queue in + descriptors because the inline data increase the descriptor size and + queue size limits supported by hardware may be exceeded. + - ``txq_inline_min`` parameter [int] Minimal amount of data to be inlined into WQE during Tx operations. NICs |