* [dpdk-dev] [PATCH] doc: inline data settings affect mlx5 Tx queue max size
@ 2019-08-08 11:47 Viacheslav Ovsiienko
2019-08-08 14:25 ` Thomas Monjalon
0 siblings, 1 reply; 2+ messages in thread
From: Viacheslav Ovsiienko @ 2019-08-08 11:47 UTC (permalink / raw)
To: dev; +Cc: yskoh, shahafs
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>
---
doc/guides/nics/mlx5.rst | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/doc/guides/nics/mlx5.rst b/doc/guides/nics/mlx5.rst
index d6082ac..72de5e6 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`` devarg 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
--
1.8.3.1
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [dpdk-dev] [PATCH] doc: inline data settings affect mlx5 Tx queue max size
2019-08-08 11:47 [dpdk-dev] [PATCH] doc: inline data settings affect mlx5 Tx queue max size Viacheslav Ovsiienko
@ 2019-08-08 14:25 ` Thomas Monjalon
0 siblings, 0 replies; 2+ messages in thread
From: Thomas Monjalon @ 2019-08-08 14:25 UTC (permalink / raw)
To: Viacheslav Ovsiienko; +Cc: dev, yskoh, shahafs
08/08/2019 13:47, Viacheslav Ovsiienko:
> 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>
Applied, thanks
^ permalink raw reply [flat|nested] 2+ messages in thread
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2019-08-08 11:47 [dpdk-dev] [PATCH] doc: inline data settings affect mlx5 Tx queue max size Viacheslav Ovsiienko
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