That might be the Spectre V2 fix on new processors, which will slow it down. Can you check output of:
cat /sys/devices/system/cpu/vulnerabilities/spectre_v2
The latest postings did not reach the mailing list but only you. Thus, in order to repeat for the others: $ cat /sys/devices/system/cpu/vulnerabilities/spectre_v2 Mitigation: Indirect Branch Restricted Speculation, IBPB, IBRS_FW I could now verify on all my PCs (two i7-7xxx (Kaby Lake), one i7-6xxx (Skylake)) that when I add the boot parameter "spectre_v2=off", all machines return to their original fast performance. With this parameter, "Vulnerable" is reported for the above command. I reported this to the MAME forum, but some people had doubts that this is an expected effect. When MAME runs in benchmark mode, it does not produce screen or audio output. Actually, it should almost only execute in userland. The mitigation should affect system calls, not a user process. It looks as if the predictor gets stuck in the "off" position after the first syscall, one of them wrote. Greetings, Michael -- To unsubscribe, e-mail: opensuse-kernel+unsubscribe@opensuse.org To contact the owner, e-mail: opensuse-kernel+owner@opensuse.org