Module: xenomai-2.5
Branch: master
Commit: 79bbd4d676320c36c7876e568cec90a0a485ee4d
URL:
http://git.xenomai.org/?p=xenomai-2.5.git;a=commit;h=79bbd4d676320c36c7876e568cec90a0a485ee4d
Author: Jan Kiszka <jan.kis...@siemens.com>
Date: Fri Jan 14 15:43:28 2011 +0100
Add INTEL_IDLE to list of problematic config options
See TROUBLESHOOTING for explanation.
Signed-off-by: Jan Kiszka <jan.kis...@siemens.com>
---
TROUBLESHOOTING | 4 ++++
scripts/Kconfig.frag | 9 +++++----
2 files changed, 9 insertions(+), 4 deletions(-)
diff --git a/TROUBLESHOOTING b/TROUBLESHOOTING
index 4d84a79..e8d4b53 100644
--- a/TROUBLESHOOTING
+++ b/TROUBLESHOOTING
@@ -57,6 +57,10 @@ sleep states, increasing latency in ways dependent upon both
the
BIOS's ACPI tables and code. You may be able to suppress the sleeping
with 'idle=poll' boot-arg, test to find out
+INTEL_IDLE: Just like ACPI_PROCESSOR, this idle driver sends the CPU
+into deep C states, also causing huge latencies because the APIC timer
+that Xenomai uses may not fire anymore.
+
Summarizing, the latencies incurred here are dependent upon CPU, BIOS,
and motherboard; ie they're hard to predict, so we are conservative.
Feel free to test on your platform, (xeno-test runs testsuite/latency
diff --git a/scripts/Kconfig.frag b/scripts/Kconfig.frag
index 3a52ed4..c136ebf 100644
--- a/scripts/Kconfig.frag
+++ b/scripts/Kconfig.frag
@@ -1,10 +1,11 @@
menu "Real-time sub-system"
-comment "WARNING! You enabled APM, CPU Frequency scaling or ACPI 'processor'"
- depends on APM || CPU_FREQ || ACPI_PROCESSOR
-comment "option. These options are known to cause troubles with Xenomai."
- depends on APM || CPU_FREQ || ACPI_PROCESSOR
+if APM || CPU_FREQ || ACPI_PROCESSOR || INTEL_IDLE
+comment "WARNING! You enabled APM, CPU Frequency scaling, ACPI 'processor'"
+comment "or Intel cpuidle option. These options are known to cause troubles"
+comment "with Xenomai, disable them."
+endif
comment "NOTE: Xenomai conflicts with PC speaker support."
depends on !X86_TSC && X86 && INPUT_PCSPKR
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