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Xiaochen Shen
95af9eff82
MBA Software Controller feature is introduced in Linux kernel v4.18. It is a software enhancement to mitigate some limitations in MBA which describes in kernel documentation. It also makes the interface more user friendly - we could specify memory bandwidth in "MBps" (Mega Bytes per second) as well as in "percentages". The kernel underneath would use a software feedback mechanism or a "Software Controller" which reads the actual bandwidth using MBM counters and adjust the memory bandwidth percentages to ensure: "actual memory bandwidth < user specified memory bandwidth". We could enable this feature through mount option "-o mba_MBps": mount -t resctrl resctrl -o mba_MBps /sys/fs/resctrl In runc, we handle both memory bandwidth schemata in unified format: "MB:<cache_id0>=bandwidth0;<cache_id1>=bandwidth1;..." The unit of memory bandwidth is specified in "percentages" by default, and in "MBps" if MBA Software Controller is enabled. For more information about Intel RDT and MBA Software Controller: https://www.kernel.org/doc/Documentation/x86/intel_rdt_ui.txt Signed-off-by: Xiaochen Shen <xiaochen.shen@intel.com>
14 lines
518 B
Go
14 lines
518 B
Go
package configs
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type IntelRdt struct {
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// The schema for L3 cache id and capacity bitmask (CBM)
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// Format: "L3:<cache_id0>=<cbm0>;<cache_id1>=<cbm1>;..."
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L3CacheSchema string `json:"l3_cache_schema,omitempty"`
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// The schema of memory bandwidth per L3 cache id
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// Format: "MB:<cache_id0>=bandwidth0;<cache_id1>=bandwidth1;..."
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// The unit of memory bandwidth is specified in "percentages" by
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// default, and in "MBps" if MBA Software Controller is enabled.
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MemBwSchema string `json:"memBwSchema,omitempty"`
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}
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