4.15 is now available in Bionic. Marking this Fix Released.
** Tags added: kernel
** Changed in: linux (Ubuntu Bionic)
Status: New => Fix Released
** Changed in: intel
Status: New => Fix Released
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https://bugs.launchpad.net/bugs/1730792
Title:
[Feature][SKL] Support disabling AVX-512
Status in intel:
Fix Released
Status in linux package in Ubuntu:
Fix Released
Status in linux source package in Bionic:
Fix Released
Bug description:
Description:
On Skylake server we have some problems with AVX512/AVX2 lowering frequency
and potentially lowering performance.
To do easy debug and as a potential solution it is useful to be able to
disable AVX512 and AVX2
I posted patches to disable AVX512/2 at the kernel level.
Once they are merged we should back port them ASAP to server oriented
distros, so that any issues on SKX deployment can be addressed.
Current patches are here
https://patchwork.kernel.org/patch/9618881/
https://patchwork.kernel.org/patch/9618883/
Note for backporting: the FPU code has been recently re-organized. So some of
the patches likely need to be moved to other files and potentially other
functions. But it's straight forward, so shouldn't be too difficult.
Commit Ids:
0b00de857a648dafe7020878c7a27cf776f5edf4
0c2a3913d6f50503f7c59d83a6219e39508cc898
57b8b1a1856adaa849d02d547411a553a531022b
73e3a7d2a7c3be29a5a22b85026f6cfa5664267f
cbe96375025e14fc76f9ed42ee5225120d7210f8
ccb18db2ab9d923df07e7495123fe5fb02329713
Target Kernel: 4.14
Target Release: 18.04
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