Messages in this thread | | | Date | Fri, 12 Nov 2021 10:00:23 -0800 | Subject | Re: [PATCH] selftests/resctrl: Skip MBM&CMT tests when Intel Sub-NUMA | From | Reinette Chatre <> |
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Hi,
On 11/10/2021 12:27 AM, Shaopeng Tan wrote: > From: "Tan, Shaopeng" <tan.shaopeng@jp.fujitsu.com> > > When the Intel Sub-NUMA Clustering(SNC) feature is enabled, > the CMT and MBM counters may not be accurate. > In this case, skip MBM&CMT tests. > > Signed-off-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com> > --- > Hello, > > According to the Intel RDT reference Manual, > when the sub-numa clustering feature is enabled, the CMT and MBM counters may not be accurate. > When running CMT tests and MBM tests on Intel processor, the result is "not ok". > So, fix it to skip the CMT & MBM test When the Intel Sub-NUMA Clustering(SNC) feature is enabled. >
It is not clear to me which exact document you refer to but I did find a RDT reference manual at the link below that describes the problem you mention: https://www.intel.com/content/dam/develop/external/us/en/documents/180115-intel-rdtcascadelake-serverreferencemanual-806717.pdf
What is not mentioned in your description is that this is a hardware errata so the test is expected to fail on these systems and I find that disabling the test for all systems based on this hardware errata is too drastic.
Reinette
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