Just some random guesses, but...since you narrowed it down to x86 and cpu...though I can't really tell what many of these are due to truncation... Michal Kubecek wrote:
On Monday, 23 April 2018 13:01 Michael Zapf wrote:
During the last days I tried to bisect the kernel source from Github
total memory encryption? sounds expensive...
patches.kernel.org/4.15.12-001-x86-cpufeatures-Add-Intel-Total-Memory-Encryp.patch patches.kernel.org/4.15.12-002-x86-cpufeatures-Add-Intel-PCONFIG-cpufeature.patch
Not sure speculation fixes shouldn't be causing *that* much slowdown... If you'd even said 30%, (which would be bad enough, IMO), I might have thought it possible, but what you are seeing seems outside what I thought were bounds...
patches.kernel.org/4.15.12-006-x86-speculation-objtool-Annotate-indirect-cal.patch patches.kernel.org/4.15.12-007-x86-speculation-Remove-Skylake-C2-from-Specul.patch
I can't see why encryption of all memory would be turned on by default, or even if that's really what that patch does, but if it *did*, ... I'd guess that it would slow things down quite a bit, but **too much** to ever be enabled by default unless there was a bug or misconfig...but still... -- To unsubscribe, e-mail: opensuse-kernel+unsubscribe@opensuse.org To contact the owner, e-mail: opensuse-kernel+owner@opensuse.org