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Clarify Intel RDT configuration #1196

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Clarify Intel RDT configuration #1196

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da3b517
config-linux: clarify the "MB:"-line filtering in RDT.
ipuustin Apr 6, 2023
a4fca5d
config-linux: clarify when the RDT sub-directory should be removed.
ipuustin Apr 6, 2023
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8 changes: 5 additions & 3 deletions config-linux.md
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Original file line number Diff line number Diff line change
Expand Up @@ -648,9 +648,7 @@ The following parameters can be specified for the container:

The following rules on parameters MUST be applied:

* If both `l3CacheSchema` and `memBwSchema` are set, runtimes MUST write the combined value to the `schemata` file in that sub-directory discussed in `closID`.

* If `l3CacheSchema` contains a line beginning with `MB:`, the value written to `schemata` file MUST be the non-`MB:` line(s) from `l3CacheSchema` and the line from `memBWSchema`.
* If both `l3CacheSchema` and `memBwSchema` are set, runtimes MUST write the values to the `schemata` file in that sub-directory discussed in `closID`. The runtimes MUST write `l3CacheSchema` first and `memBwSchema` last.

* If either `l3CacheSchema` or `memBwSchema` is set, runtimes MUST write the value to the `schemata` file in the that sub-directory discussed in `closID`.

Expand All @@ -664,6 +662,10 @@ The following rules on parameters MUST be applied:

* If `closID` is set, and neither of `l3CacheSchema` and `memBwSchema` are set, runtime MUST check if corresponding pre-configured directory `closID` is present in mounted `resctrl`. If such pre-configured directory `closID` exists, runtime MUST assign container to this `closID` and [generate an error](runtime.md#errors) if directory does not exist.

* If `closID` is not set and the runtime has created the sub-directory, the runtime MUST remove the sub-directory when the container is deleted.

* If `closID` is set or the runtime has not created the sub-directory, the runtime MUST NOT remove the sub-directory when the container is deleted.

* **`enableCMT`** *(boolean, OPTIONAL)* - specifies if Intel RDT CMT should be enabled:
* CMT (Cache Monitoring Technology) supports monitoring of the last-level cache (LLC) occupancy
for the container.
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