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.h...@intel.com>
---
doc/guides/rel_notes/release_22_03.rst | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/doc/guides/rel_notes/release_22_03.rst
b/doc/guides/rel_notes/release_22_03.rst
index 60e5b4f9aa..34d6f34dba 100644
--- a/doc/guides/rel_notes/release_22_03.rst
+++ b/doc/guides/rel_notes/release_22_03.rst
@@ -313,6 +313,17 @@ 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. In rte_power_monitor_multi(), the
+ function may return without successfully starting the RTM
+ transaction (the _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
----------------
--
2.17.1
