Re: Slowdown with kernel 4.18.0

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On 21.08.2018 13:51, Rolf Eike Beer wrote:
> I switched from 4.17.3 to 4.18.0 on my C8000 on Friday. Since then I see a massive slowdown in my CDash builds (building CMake, libarchive, Qsmtp). From what I see this seems not to be related to any change in the projects:

You could try to revert the memory barrier patches:
* https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=fedb8da96355f5f64353625bf96dc69423ad1826
and/or the default-enabled CONFIG_MLONGCALLS option:
* http://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=66509a276c8c1d19ee3f661a41b418d101c57d29

Helge

> 
> Timing before:
> pioneer.sf-tec.de    Gentoo HPPA C8000 GCC 4.7 Aug 17, 2018 - 13:37
> pioneer.sf-tec.de    Gentoo HPPA C8000 GCC 4.8 Aug 17, 2018 - 11:19
> pioneer.sf-tec.de    Gentoo HPPA C8000 GCC 4.9 Aug 17, 2018 - 09:06
> pioneer.sf-tec.de    Gentoo HPPA C8000 GCC 5   Aug 17, 2018 - 06:50
> pioneer.sf-tec.de    Gentoo HPPA C8000 GCC 6   Aug 17, 2018 - 04:25
> pioneer.sf-tec.de    Gentoo HPPA C8000 GCC 7   Aug 17, 2018 - 00:54
> 
> Timing after:
> pioneer.sf-tec.de    Gentoo HPPA C8000 GCC 4.9 Aug 20, 2018 - 13:02:06
> pioneer.sf-tec.de    Gentoo HPPA C8000 GCC 5   Aug 20, 2018 - 10:04:10
> pioneer.sf-tec.de    Gentoo HPPA C8000 GCC 6   Aug 20, 2018 - 06:51
> pioneer.sf-tec.de    Gentoo HPPA C8000 GCC 7   Aug 20, 2018 - 02:08




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