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| author | Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com> | 2012-09-27 10:08:00 -0700 |
|---|---|---|
| committer | Tony Luck <tony.luck@intel.com> | 2012-09-27 10:08:00 -0700 |
| commit | 450cc201038f31bd496e1b3a44a49790b8827a06 (patch) | |
| tree | 254dd5a157702dad656ac37815fb346df94f8d8d /Documentation/x86 | |
| parent | 961ebea4ae68075bb5a0acc19f5852bed82bb877 (diff) | |
| download | lwn-450cc201038f31bd496e1b3a44a49790b8827a06.tar.gz lwn-450cc201038f31bd496e1b3a44a49790b8827a06.zip | |
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.txt | 7 |
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 c54b4f503e2a..de38429beb71 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 |