Comment # 21 on bug 1117833 from Victor Zhestkov

Hi.
It seems nosmt=force and disabling HT in BIOS is different in behaviour. Not
sure, but system looks more responsive with nosmt=force.
And spectre_v2_user=off really makes sense.
/sys/devices/system/cpu/vulnerabilities/l1tf:Mitigation: PTE Inversion; VMX:
conditional cache flushes, SMT disabled
/sys/devices/system/cpu/vulnerabilities/meltdown:Mitigation: PTI
/sys/devices/system/cpu/vulnerabilities/spec_store_bypass:Mitigation:
Speculative Store Bypass disabled via prctl and seccomp
/sys/devices/system/cpu/vulnerabilities/spectre_v1:Mitigation: __user pointer
sanitization
/sys/devices/system/cpu/vulnerabilities/spectre_v2:Mitigation: Indirect Branch
Restricted Speculation, IBPB: disabled, IBRS_FW, STIBP: disabled, RSB filling

I'll also attach my dmesg output. Now I'm using 4.20.3-2.g4b478de-default
kernel from https://download.opensuse.org/repositories/Kernel:/stable/standard/
and with no boot options it seems to work slightly better than 4.20.0 from TW
20190115.

I've tried the other Linux distribs and it seems only openSUSE is affected
while using GNOME, I don't see the issue with other WMs.
Wayland behavior is different than in XOrg.
bug#1112824 seems really the same issue.