diff options
Diffstat (limited to 'schulung_tools/notes/preempt-rt-tips.txt')
| -rw-r--r-- | schulung_tools/notes/preempt-rt-tips.txt | 50 |
1 files changed, 50 insertions, 0 deletions
diff --git a/schulung_tools/notes/preempt-rt-tips.txt b/schulung_tools/notes/preempt-rt-tips.txt new file mode 100644 index 0000000..89b4204 --- /dev/null +++ b/schulung_tools/notes/preempt-rt-tips.txt @@ -0,0 +1,50 @@ +# download 4.14 kernel +wget --continue https://cdn.kernel.org/pub/linux/kernel/v4.x/linux-4.14.tar.xz + +# download 4.14 -> 4.14.27 stable kernel patch +wget --continue https://cdn.kernel.org/pub/linux/kernel/v4.x/patch-4.14.27.xz + +# download 4.14.27 -> 4.14.27-rt21 realtime kernel patch +wget --continue https://www.kernel.org/pub/linux/kernel/projects/rt/4.14/older/patch-4.14.27-rt21.patch.xz + +# unpack 4.14 kernel +tar xJf linux-4.14.tar.xz + +# apply 4.14.27 stable kernel patch +xzcat patch-4.14.27.xz | patch -p 1 -d linux-4.14 + +# apply 4.14.27-rt21 realtime kernel patch +xzcat patch-4.14.27-rt21.patch.xz | patch -p 1 -d linux-4.14 + + +# +# kernel options to be aware of +# +# (must be set to activate all realtime features) +# CONFIG_PREEMPT_RT_FULL +# +# (disable prio99 watchdog debug tasks, unless really needed/wanted) +# CONFIG_LOCKUP_DETECTOR +# CONFIG_DETECT_HUNG_TASK +# +# (reduced power, but greater latencies, disable it) +# (use CONFIG_100_HZ and CONFIG_HZ_PERIODIC instead) +# CONFIG_NO_HZ +# +# (additional NOPs inserted to each function, ok to enable so you have ftrace) +# CONFIG_FTRACE +# +# (reduced power, but greater latencies, disable appropriately) +# CONFIG_CPU_IDLE +# +# (may cause very large overheads and latencies, disable appropriately) +# CONFIG_DEBUG_* +# +# (make sure these are enabled, but only use "performance") +# CONFIG_CPU_FREQ_GOV_* +# CONFIG_CPU_FREQ_DEFAULT_* +# +# (causes unnecessary processing, for systems that do not need it, +# disable if not needed) +# CONFIG_HIGHMEM +# |