On 19/08/2020 10:16, Muni Sekhar wrote: > On Tue, Aug 18, 2020 at 11:45 PM peter enderborg > <peter.enderborg@xxxxxxxx> wrote: [...] >> On the 4.4 kernel you dont have >> >> +CONFIG_RETPOLINE=y >> +CONFIG_INTEL_RDT=y > Thanks! That is helpful. Yes, I see 4.4 kernel don't have the above > two config options. > What analysis can be done to narrow down the root cause? > Any example of reference could be helpful to understand. I haven't checked the date of the older kernel but Spectre+ Meltdown mitigation costs a lot (20%-30% speed IIRC, out of the top of my head). MfG, Bernd -- There is no cloud, just other people computers. -- https://static.fsf.org/nosvn/stickers/thereisnocloud.svg
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