On Wed, Oct 31, 2018 at 09:14:58AM +0100, Daniel Wagner wrote:
> From: Daniel Wagner
>
> Sebastian writes:
>
> """
> We reproducibly observe cache line starvation on a Core2Duo E6850 (2
> cores), a i5-6400 SKL (4 cores) and on a NXP LS2044A ARM Cortex-A72 (4
> cores).
>
> The problem can be tri
On Wed, Oct 31, 2018 at 09:14:58AM +0100, Daniel Wagner wrote:
> From: Daniel Wagner
>
> Sebastian writes:
>
> """
> We reproducibly observe cache line starvation on a Core2Duo E6850 (2
> cores), a i5-6400 SKL (4 cores) and on a NXP LS2044A ARM Cortex-A72 (4
> cores).
>
> The problem can be tri
On Wed, 31 Oct 2018, Daniel Wagner wrote:
> Backporting all qspinlock related patches is very likely to introduce
> regressions on v4.4. Therefore, the recommended solution by Peter and
> Thomas is to drop back to ticket spinlocks for v4.4.
>
> Link :https://lkml.kernel.org/r/20180921120226.6xjgr4
From: Daniel Wagner
Sebastian writes:
"""
We reproducibly observe cache line starvation on a Core2Duo E6850 (2
cores), a i5-6400 SKL (4 cores) and on a NXP LS2044A ARM Cortex-A72 (4
cores).
The problem can be triggered with a v4.9-RT kernel by starting
cyclictest -S -p98 -m -i2000 -b 200
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