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[1/1] doc: expand description of no-huge and PMD issue

Message ID 20220609134011.725343-1-kda@semihalf.com (mailing list archive)
State New
Delegated to: Thomas Monjalon
Headers show
Series [1/1] doc: expand description of no-huge and PMD issue | expand

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Commit Message

Stanisław Kardach June 9, 2022, 1:40 p.m. UTC
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@semihalf.com>
---
 doc/guides/rel_notes/known_issues.rst | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

Comments

David Marchand June 13, 2022, 9:31 a.m. UTC | #1
On Thu, Jun 9, 2022 at 3:40 PM Stanislaw Kardach <kda@semihalf.com> wrote:
>
> 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@semihalf.com>

Anatoly, Dmitry, opinions?
Thanks.
Thomas Monjalon July 11, 2022, 9:09 p.m. UTC | #2
13/06/2022 11:31, David Marchand:
> On Thu, Jun 9, 2022 at 3:40 PM Stanislaw Kardach <kda@semihalf.com> wrote:
> >
> > 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@semihalf.com>
> 
> Anatoly, Dmitry, opinions?
> Thanks.

Why nobody is reviewing doc?
diff mbox series

Patch

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.