Linux – How to monitor RAM ECC errors on Ivy Bridge Xeon E3 processor in Linux

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How can I monitor if there are any errors in RAM that get corrected by ECC? The processor is an Intel Xeon (Ivy Bridge) processor, the operating system is Scientific Linux 6.3. On a previous system I had an AMD CPU, and on that system I could use edac-util to get this info, and it would also issue alerts to the kernel log.

Best Answer

As for as I can find only E5 Xeons are supported with the sb_edac module

http://www.spinics.net/lists/linux-edac/msg00846.html

This is a kernel bug

This is exactly how one controls the settings, but there is a bug in the kernel that causes the readout from the hardware to always return 0 for this CPU.

A patch to fix it has been queued but I do not know when it will trickle down into the main kernel. I may update the answer when it happens.

With the patch applied, the output from the commands used in the question is then:

# echo 1000000 >/sys/devices/system/edac/mc/mc0/sdram_scrub_rate
# echo $?
0
# cat /sys/devices/system/edac/mc/mc0/sdram_scrub_rate
781440

781440 being the number of bytes that is scrubbed by the memory controller mc0 every second, quantized to the nearest possible value from the requested 1000000.

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How to Enable and Verify ECC RAM Scrubbing in Linux

This is a kernel bug

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