Hi, I wonder what results you get, if you run cyclictest on your machine, what ever kernel you are using. I've done this for 4.14.6-rt7 from https://aur.archlinux.org/pkgbase/linux-rt [1] and for 4.14.6-rt7 less patched, using a different config [2]. Regards, Ralf [1] [rocketmouse@archlinux ~]$ cat /var/log/rtest/rtest-20171221_195747.log sudo hwinfo --cpu | grep -m1 Model Model: 6.60.3 "Intel(R) Celeron(R) CPU G1840 @ 2.80GHz" uname -a Linux archlinux 4.14.6-rt7-1-rt #1 SMP PREEMPT RT Wed Dec 20 22:37:18 CET 2017 x86_64 GNU/Linux cat /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor performance performance [2017-12-21 19:57] cyclictest -S -m -p98 WARN: open /dev/cpu_dma_latency: Permission denied policy: fifo: loadavg: 0.13 0.09 0.02 1/208 4690 T: 0 ( 1245) P:98 I:1000 C:35539474 Min: 1 Act: 31 Avg: 27 Max: 76 T: 1 ( 1246) P:98 I:1500 C:23692982 Min: 1 Act: 31 Avg: 28 Max: 83 [2017-12-22 05:50] [2] [rocketmouse@archlinux ~]$ cat /var/log/rtest/rtest-20171221_085832.log sudo hwinfo --cpu | grep -m1 Model Model: 6.60.3 "Intel(R) Celeron(R) CPU G1840 @ 2.80GHz" uname -a Linux archlinux 4.14.6-rt7-1-rt-pussytoes #1 SMP PREEMPT RT Tue Dec 19 05:51:37 CET 2017 x86_64 GNU/Linux cat /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor performance performance [2017-12-21 08:58] cyclictest -S -m -p98 WARN: open /dev/cpu_dma_latency: Permission denied policy: fifo: loadavg: 0.36 0.26 0.11 1/217 30782 T: 0 (30748) P:98 I:1000 C:5147453 Min: 1 Act: 40 Avg: 28 Max: 68 T: 1 (30749) P:98 I:1500 C:3431635 Min: 1 Act: 32 Avg: 31 Max: 61 [2017-12-21 10:24] -- $ pacman -Q linux{,-rt{,-cornflower,-pussytoes}}|awk '{print $2}' 4.14.7-1 4.14.6_rt7-1 4.11.12_rt16-1 4.14.6_rt7-1