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author | Christian Ehrhardt <christian.ehrhardt@canonical.com> | 2019-04-15 14:36:48 +0200 |
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committer | Christian Ehrhardt <christian.ehrhardt@canonical.com> | 2019-04-15 14:39:46 +0200 |
commit | e2bea7436061ca2e7e14bfcfdc5870f2555c3965 (patch) | |
tree | 46c62ce8f227674d6880430f9623edb4e77b9f9a /doc/guides/rel_notes/known_issues.rst | |
parent | a4f0fa29488e582ab8b5ef9db475b3d26ded690c (diff) |
New upstream version 18.11.1
Change-Id: Ic52e74a9ed6f3ae06acea4a27357bd7153efc2a3
Signed-off-by: Christian Ehrhardt <christian.ehrhardt@canonical.com>
Diffstat (limited to 'doc/guides/rel_notes/known_issues.rst')
-rw-r--r-- | doc/guides/rel_notes/known_issues.rst | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/doc/guides/rel_notes/known_issues.rst b/doc/guides/rel_notes/known_issues.rst index a1face9c..358dfa32 100644 --- a/doc/guides/rel_notes/known_issues.rst +++ b/doc/guides/rel_notes/known_issues.rst @@ -826,3 +826,38 @@ Kernel crash when hot-unplug igb_uio device while DPDK application is running **Driver/Module**: ``igb_uio`` module. + + +AVX-512 support disabled +------------------------ + +**Description**: + ``AVX-512`` support has been disabled on some conditions. + This shouldn't be confused with ``CONFIG_RTE_ENABLE_AVX512`` config option which is already + disabled by default. This config option defines if ``AVX-512`` specific implementations of + some file to be used or not. What has been disabled is compiler feature to produce ``AVX-512`` + instructions from any source code. + + On DPDK v18.11 ``AVX-512`` is disabled for all ``GCC`` builds which reported to cause a performance + drop. + + On DPDK v19.02 ``AVX-512`` disable scope is reduced to ``GCC`` and ``binutils version 2.30`` based + on information accured from the GCC community defect. + +**Reason**: + Generated ``AVX-512`` code cause crash: + https://bugs.dpdk.org/show_bug.cgi?id=97 + https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88096 + +**Resolution/Workaround**: + * Update ``binutils`` to newer version than ``2.30``. + + OR + + * Use different compiler, like ``clang`` for this case. + +**Affected Environment/Platform**: + ``GCC`` and ``binutils version 2.30``. + +**Driver/Module**: + ALL. |