[18.04 certification] R740xd Memory Info Fails; nvdimm mismatch

Bug #1772685 reported by Michael Reed on 2018-05-22
This bug affects 1 person
Affects Status Importance Assigned to Milestone

Bug Description

This test is currently failing on the R740xd

Check amount of memory reported by meminfo against DMI

 /proc/meminfo reports: 62.43GiB
 lshw reports: 80GiB

FAIL: Meminfo reports 18864824320 less than lshw, a difference of 21.96%. Only a variance of 10% in reported memory is allowed.

Michael Reed (mreed8855) on 2018-05-22
summary: - [18.04 certification] 740xd Memory Info Fails
+ [18.04 certification] R740xd Memory Info Fails

This may be innocuous, or you may have bad ram. This is saying that the system has 80 GiB of RAM installed physically but the kernel is only addressing roughly 62.3GiB.

There is often a small amount of overhead in RAM, and also depending on the system there may be an arbitrary amount of system RAM reserved for an onboard video device.

I'd start by verifying that one of the above isn't the case.

a dmesg dump would be useful too.

Changed in dellserver:
status: New → Incomplete
Michael Reed (mreed8855) wrote :
Changed in dellserver:
status: Incomplete → In Progress
Jeff Lane (bladernr) wrote :

So, a dmesg dump after a fresh boot (or maybe /var/log/dmesg would suffice). that dump is not useful, unfortunately, as all the important data has already been popped off of the ring buffer.

Changed in dellserver:
status: In Progress → New
status: New → Incomplete
Jerry Clement (jerry-clement) wrote :

We resolved the mismatch by removing an NVDIMM placed into the system by another engineer. We should test with NVDIMM again to confirm and resolve.

summary: - [18.04 certification] R740xd Memory Info Fails
+ [18.04 certification] R740xd Memory Info Fails; nvdimm mismatch
Michael Reed (mreed8855) wrote :

We can retest the system on 18.04.1 with the latest SRU updates.

Jeff Lane (bladernr) wrote :

That's interesting to note. NVDIMMs do change the parameter of this test. Please do confirm this behaviour (per Jerry's comment from last June).

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