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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>
123 lines
2.7 KiB
Go
123 lines
2.7 KiB
Go
// +build linux
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package intelrdt
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import (
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"strings"
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"testing"
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)
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func TestIntelRdtSetL3CacheSchema(t *testing.T) {
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if !IsCatEnabled() {
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return
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}
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helper := NewIntelRdtTestUtil(t)
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defer helper.cleanup()
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const (
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l3CacheSchemaBefore = "L3:0=f;1=f0"
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l3CacheSchemeAfter = "L3:0=f0;1=f"
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)
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helper.writeFileContents(map[string]string{
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"schemata": l3CacheSchemaBefore + "\n",
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})
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helper.IntelRdtData.config.IntelRdt.L3CacheSchema = l3CacheSchemeAfter
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intelrdt := &IntelRdtManager{
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Config: helper.IntelRdtData.config,
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Path: helper.IntelRdtPath,
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}
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if err := intelrdt.Set(helper.IntelRdtData.config); err != nil {
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t.Fatal(err)
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}
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tmpStrings, err := getIntelRdtParamString(helper.IntelRdtPath, "schemata")
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if err != nil {
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t.Fatalf("Failed to parse file 'schemata' - %s", err)
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}
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values := strings.Split(tmpStrings, "\n")
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value := values[0]
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if value != l3CacheSchemeAfter {
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t.Fatal("Got the wrong value, set 'schemata' failed.")
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}
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}
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func TestIntelRdtSetMemBwSchema(t *testing.T) {
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if !IsMbaEnabled() {
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return
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}
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helper := NewIntelRdtTestUtil(t)
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defer helper.cleanup()
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const (
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memBwSchemaBefore = "MB:0=20;1=70"
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memBwSchemeAfter = "MB:0=70;1=20"
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)
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helper.writeFileContents(map[string]string{
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"schemata": memBwSchemaBefore + "\n",
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})
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helper.IntelRdtData.config.IntelRdt.MemBwSchema = memBwSchemeAfter
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intelrdt := &IntelRdtManager{
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Config: helper.IntelRdtData.config,
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Path: helper.IntelRdtPath,
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}
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if err := intelrdt.Set(helper.IntelRdtData.config); err != nil {
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t.Fatal(err)
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}
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tmpStrings, err := getIntelRdtParamString(helper.IntelRdtPath, "schemata")
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if err != nil {
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t.Fatalf("Failed to parse file 'schemata' - %s", err)
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}
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values := strings.Split(tmpStrings, "\n")
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value := values[0]
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if value != memBwSchemeAfter {
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t.Fatal("Got the wrong value, set 'schemata' failed.")
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}
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}
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func TestIntelRdtSetMemBwScSchema(t *testing.T) {
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if !IsMbaScEnabled() {
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return
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}
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helper := NewIntelRdtTestUtil(t)
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defer helper.cleanup()
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const (
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memBwScSchemaBefore = "MB:0=5000;1=7000"
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memBwScSchemeAfter = "MB:0=9000;1=4000"
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)
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helper.writeFileContents(map[string]string{
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"schemata": memBwScSchemaBefore + "\n",
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})
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helper.IntelRdtData.config.IntelRdt.MemBwSchema = memBwScSchemeAfter
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intelrdt := &IntelRdtManager{
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Config: helper.IntelRdtData.config,
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Path: helper.IntelRdtPath,
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}
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if err := intelrdt.Set(helper.IntelRdtData.config); err != nil {
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t.Fatal(err)
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}
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tmpStrings, err := getIntelRdtParamString(helper.IntelRdtPath, "schemata")
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if err != nil {
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t.Fatalf("Failed to parse file 'schemata' - %s", err)
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}
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values := strings.Split(tmpStrings, "\n")
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value := values[0]
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if value != memBwScSchemeAfter {
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t.Fatal("Got the wrong value, set 'schemata' failed.")
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}
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}
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