[PATCH 1/1] doc: expand description of no-huge and PMD issue
Stanislaw Kardach
kda at semihalf.com
Thu Jun 9 15:40:11 CEST 2022
Add more details to the description of a known issue of PMDs not being
usable when --no-huge EAL command line parameter is used. The issue
actually happens whenever there is a need for physical addresses, even
when there is no PMD attached.
Signed-off-by: Stanislaw Kardach <kda at semihalf.com>
---
doc/guides/rel_notes/known_issues.rst | 10 +++++++---
1 file changed, 7 insertions(+), 3 deletions(-)
diff --git a/doc/guides/rel_notes/known_issues.rst b/doc/guides/rel_notes/known_issues.rst
index 570550843a..2e0ffbdd93 100644
--- a/doc/guides/rel_notes/known_issues.rst
+++ b/doc/guides/rel_notes/known_issues.rst
@@ -249,11 +249,15 @@ PMD does not work with --no-huge EAL command line parameter
-----------------------------------------------------------
**Description**:
- Currently, the DPDK does not store any information about memory allocated by ``malloc()` (for example, NUMA node,
- physical address), hence PMDs do not work when the ``--no-huge`` command line parameter is supplied to EAL.
+ Currently, the DPDK does not store any information about memory allocated by ``malloc()`` (for example, NUMA node,
+ physical address), hence PMDs do not work when the ``--no-huge`` command line parameter is supplied to EAL. This
+ happens when using non-IOMMU based UIO drivers (i.e. ``igb_uio`` or ``uio_pci_generic``) or when IOVA mode is
+ explicitly set to use physical addresses (via the ``--iova-mode=pa`` EAL parameter).
**Implication**:
- Sending and receiving data with PMD will not work.
+ Sending and receiving data with PMD will not work. Unit tests checking ``--no-huge`` operation will fail if
+ there is a device bound to the PMD (eal_flags_n_opt_autotest, eal_flags_no_huge_autotest,
+ eal_flags_vdev_opt_autotest, eal_flags_misc_autotest).
**Resolution/Workaround**:
Use huge page memory or use VFIO to map devices.
--
2.30.2
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