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doc: add PMD power management errata with RTM and GCC 9

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An errata exists where users may see reduced power savings when using
PMD Power Management. This issue occurs when compiling DPDK applications
with GCC-9 on platforms with TSX enabled. In rte_power_monitor_multi(),
the function may return without successfully starting the RTM
transaction (the _xbegin() fails).

Signed-off-by: David Hunt <david.hunt@intel.com>
This commit is contained in:
David Hunt 2022-03-09 13:22:21 +00:00 committed by Thomas Monjalon
parent 047c25401d
commit ba7b205a98
1 changed files with 12 additions and 0 deletions
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doc/guides/rel_notes/release_22_03.rst
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@ -313,6 +313,18 @@ Known Issues
Also, make sure to start the actual text at the margin.
=======================================================
* **Possible reduced power saving with PMD Power Management.**
Users may see reduced power savings when using PMD Power Management.
This issue occurs when compiling DPDK applications with GCC-9
on platforms with TSX enabled.
The function ``rte_power_monitor_multi()`` may return
without successfully starting the RTM transaction (``_xbegin()`` fails).
There are three workarounds for this issue.
Either build DPDK with GCC-11 or newer, build with shared libraries,
or build DPDK with fewer drivers.
Tested Platforms
----------------