Unterschiede

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--- embedded_systems:ethercat:test_and_tune_rt [2018-12-14 16:16] – mgehrig2
+++ embedded_systems:ethercat:test_and_tune_rt [2018-12-18 09:49] – mgehrig2
@@ Zeile 19: / Zeile 19: @@
 In such systems the OS provides the clock for the whole system.\\
 ''max. jitter OS = min jitter EtherCAT bus''
+If the master cannot guarantee a stable clock, the masterShift mode is recommended.
 See [[embedded_systems:ethercat:distributed_clocks|Distributed Clocks]] for more information.
@@ Zeile 49: / Zeile 51: @@
 ''sudo cpupower frequency-set -g powersave''
+==== Intel cstates ====
+Intel cstates indicate the power saving state of the processor.
+These states can be locked with kernel parameters on the C0 state (no power saving measures).
+{{:embedded_systems:ethercat:controlling_processor_c-state_usage_in_linux_v1.1_nov2013.pdf|Background information}}
+Display current kernel parameters:\\
+''cat /proc/cmdline''
+Add kernel parameters:\\
+  - ''sudo nano /etc/default/grub''
+  - Add ''cpuidle.off=1 intel_idle.max_cstate=0'' to the line:
+    * ''GRUB_CMDLINE_LINUX_DEFAULT="quiet splash''
+  - It should look like this:
+    * ''GRUB_CMDLINE_LINUX_DEFAULT="quiet splash cpuidle.off=1 intel_idle.max_cstate=0''
+  - ''sudo update-grub''
+  - reboot the pc

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