doc: announce disabling GCC AVX512F as known issue
Document that AVX512F has been disabled for GCC builds [1] and document
its potential implications on release notes, known issue section.
[1]
Commit 8d07c82b23
("mk: disable gcc AVX512F support")
Signed-off-by: Ferruh Yigit <ferruh.yigit@intel.com>
Acked-by: John McNamara <john.mcnamara@intel.com>
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@ -584,6 +584,17 @@ Known Issues
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* IBM Power8 is not supported by this release of DPDK. IBM Power9 is supported.
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* IBM Power8 is not supported by this release of DPDK. IBM Power9 is supported.
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* ``AVX-512`` support has been disabled for ``GCC`` builds [1] because of a crash [2].
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This can affect ``native`` machine type build targets on the platforms that support
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``AVX512F`` like ``Intel Skylake`` processors, and can cause a possible performance drop.
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The immediate workaround is to use ``clang`` compiler on these platforms.
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Issue has been identified as a GCC defect and reported to GCC community [3]. Further
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actions will be taken based on the GCC defect result.
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[1]: Commit 8d07c82b239f ("mk: disable gcc AVX512F support")
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[2]: https://bugs.dpdk.org/show_bug.cgi?id=97
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[3]: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88096
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Tested Platforms
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Tested Platforms
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----------------
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----------------
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