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--- embedded_systems:ethercat:test_and_tune_rt [2018-12-14 16:16] – mgehrig2
+++ embedded_systems:ethercat:test_and_tune_rt [2023-04-11 11:12] (aktuell) – Urs Graf
@@ Zeile 20: / Zeile 20: @@
 ''max. jitter OS = min jitter EtherCAT bus''
-See [[embedded_systems:ethercat:distributed_clocks|Distributed Clocks]] for more information.
+If the master cannot guarantee a stable clock, the masterShift mode is recommended.
+See [[embedded_systems:ethercat:understanding_ethercat:understanding_sync_with_dc|Distributed Clocks]] for more information.
@@ Zeile 26: / Zeile 28: @@
 ==== Cyclictest ====
 The Cyclictest is a software that can be used to easily measure the maximum jitter of a system.
-[[software:linux:cyclictest:start|This page]] explains how to install and use the software.
+[[software:linux:realtime:cyclictest|Cyclictest]] explains how to install and use the software.
 === Quick Measurement ===
 ''sudo ./cyclictest -p 80 -t5 -n''
@@ 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 the following [[software:linux:linux_os:kernel_parameter|kernel parameters]]:
+  * cpuidle.off=1
+  * intel_idle.max_cstate=0

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