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authorNaveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>2012-09-27 17:08:00 (GMT)
committerTony Luck <tony.luck@intel.com>2012-09-27 17:08:00 (GMT)
commit450cc201038f31bd496e1b3a44a49790b8827a06 (patch)
tree254dd5a157702dad656ac37815fb346df94f8d8d /Documentation/x86
parent961ebea4ae68075bb5a0acc19f5852bed82bb877 (diff)
x86/mce: Provide boot argument to honour bios-set CMCI threshold
The ACPI spec doesn't provide for a way for the bios to pass down recommended thresholds to the OS on a _per-bank_ basis. This patch adds a new boot option, which if passed, tells Linux to use CMCI thresholds set by the bios. As fail-safe, we initialize threshold to 1 if some banks have not been initialized by the bios and warn the user. Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com> Signed-off-by: Tony Luck <tony.luck@intel.com>
Diffstat (limited to 'Documentation/x86')
-rw-r--r--Documentation/x86/x86_64/boot-options.txt7
1 files changed, 7 insertions, 0 deletions
diff --git a/Documentation/x86/x86_64/boot-options.txt b/Documentation/x86/x86_64/boot-options.txt
index c54b4f5..de38429 100644
--- a/Documentation/x86/x86_64/boot-options.txt
+++ b/Documentation/x86/x86_64/boot-options.txt
@@ -50,6 +50,13 @@ Machine check
monarchtimeout:
Sets the time in us to wait for other CPUs on machine checks. 0
to disable.
+ mce=bios_cmci_threshold
+ Don't overwrite the bios-set CMCI threshold. This boot option
+ prevents Linux from overwriting the CMCI threshold set by the
+ bios. Without this option, Linux always sets the CMCI
+ threshold to 1. Enabling this may make memory predictive failure
+ analysis less effective if the bios sets thresholds for memory
+ errors since we will not see details for all errors.
nomce (for compatibility with i386): same as mce=off

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