On Fri, 20 Jul 2018 22:02:05 -1000, david wrote: >On 07/19/2018 11:56 PM, Ralf Mardorf wrote: >> Mitigation: PTI >> Vulnerable >> Mitigation: __user pointer sanitization >> Mitigation: Full generic retpoline, IBPB, IBRS_FW >> >> 'nopti' only would disable PTI, but keep the spectre mitigations. >> While PTI is part of the kernel, the spectre mitigations are likely >> part of the µcode. However, if I would run my CPU without the µcode, >> I perhaps would get rid of the spectre mitigation, but IIRC I >> unfortunately would get rid of TSC, too. > >The Spectre mitigations don't seem to affect the performance on my >desktop, which is running with PTI off but with the mitigation >microcode patches. I also have Spectre mitigations on my Intel laptop >with no performance impact. At the moment I test 'nopti' again for a non-audio session. [rocketmouse@archlinux ~]$ ls -hAl /sys/devices/system/cpu/vulnerabilities/; cat /sys/devices/system/cpu/vulnerabilities/* total 0 -r--r--r-- 1 root root 4.0K Jul 21 02:34 meltdown -r--r--r-- 1 root root 4.0K Jul 21 02:34 spec_store_bypass -r--r--r-- 1 root root 4.0K Jul 21 02:34 spectre_v1 -r--r--r-- 1 root root 4.0K Jul 21 02:34 spectre_v2 Vulnerable Vulnerable Mitigation: __user pointer sanitization Mitigation: Full generic retpoline, IBPB, IBRS_FW It doesn't solve some issues on my machine and at least for non-audio a possible better performance of my computer isn't of value to disable PTI. I'll build 4.16.18-rt10 now, maybe it takes less time than I needed to build 4.16.18-rt9 with PTI enabled. _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx https://lists.linuxaudio.org/listinfo/linux-audio-user
