* [dpdk-dev] [PATCH] doc: announce disabling GCC AVX512F as known issue
@ 2018-11-20 12:50 Ferruh Yigit
2018-11-22 18:00 ` Mcnamara, John
0 siblings, 1 reply; 3+ messages in thread
From: Ferruh Yigit @ 2018-11-20 12:50 UTC (permalink / raw)
To: John McNamara, Marko Kovacevic
Cc: dev, Ferruh Yigit, Bruce Richardson, Konstantin Ananyev
Document that AVX512F has been disabled for GCC builds [1] and document
its potential implications on release notes, known issue section.
[1]
Commit 8d07c82b239f ("mk: disable gcc AVX512F support")
Signed-off-by: Ferruh Yigit <ferruh.yigit@intel.com>
---
doc/guides/rel_notes/release_18_11.rst | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/doc/guides/rel_notes/release_18_11.rst b/doc/guides/rel_notes/release_18_11.rst
index 32ff0e5c0..1116aff57 100644
--- a/doc/guides/rel_notes/release_18_11.rst
+++ b/doc/guides/rel_notes/release_18_11.rst
@@ -567,6 +567,17 @@ Known Issues
* IBM Power8 is not supported by this release of DPDK. IBM Power9 is supported.
+* ``AVX-512`` support has been disabled for ``GCC`` builds [1] because of a crash [2].
+ This can affect ``native`` machine type build targets on the platforms that support
+ ``AVX512F`` like ``Intel Skylake`` processors, and can cause a possible performance drop.
+ The immediate workaround is to use ``clang`` compiler on these platforms.
+ Issue has been identified as a GCC defect and reported to GCC community [3]. Further
+ actions will be taken based on the GCC defect result.
+
+ [1]: Commit 8d07c82b239f ("mk: disable gcc AVX512F support")
+ [2]: https://bugs.dpdk.org/show_bug.cgi?id=97
+ [3]: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88096
+
Tested Platforms
----------------
--
2.17.2
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [dpdk-dev] [PATCH] doc: announce disabling GCC AVX512F as known issue
2018-11-20 12:50 [dpdk-dev] [PATCH] doc: announce disabling GCC AVX512F as known issue Ferruh Yigit
@ 2018-11-22 18:00 ` Mcnamara, John
2018-11-23 2:02 ` Thomas Monjalon
0 siblings, 1 reply; 3+ messages in thread
From: Mcnamara, John @ 2018-11-22 18:00 UTC (permalink / raw)
To: Yigit, Ferruh, Kovacevic, Marko
Cc: dev, Richardson, Bruce, Ananyev, Konstantin
> -----Original Message-----
> From: Yigit, Ferruh
> Sent: Tuesday, November 20, 2018 12:51 PM
> To: Mcnamara, John <john.mcnamara@intel.com>; Kovacevic, Marko
> <marko.kovacevic@intel.com>
> Cc: dev@dpdk.org; Yigit, Ferruh <ferruh.yigit@intel.com>; Richardson,
> Bruce <bruce.richardson@intel.com>; Ananyev, Konstantin
> <konstantin.ananyev@intel.com>
> Subject: [PATCH] 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.
>
Acked-by: John McNamara <john.mcnamara@intel.com>
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [dpdk-dev] [PATCH] doc: announce disabling GCC AVX512F as known issue
2018-11-22 18:00 ` Mcnamara, John
@ 2018-11-23 2:02 ` Thomas Monjalon
0 siblings, 0 replies; 3+ messages in thread
From: Thomas Monjalon @ 2018-11-23 2:02 UTC (permalink / raw)
To: Yigit, Ferruh
Cc: dev, Mcnamara, John, Kovacevic, Marko, Richardson, Bruce,
Ananyev, Konstantin
22/11/2018 19:00, Mcnamara, John:
> From: Yigit, Ferruh
> >
> > Document that AVX512F has been disabled for GCC builds [1] and document
> > its potential implications on release notes, known issue section.
> >
>
> Acked-by: John McNamara <john.mcnamara@intel.com>
Applied, thanks
^ permalink raw reply [flat|nested] 3+ messages in thread
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