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https://github.com/kubernetes-sigs/node-feature-discovery.git
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882bbeea3f
Some workloads may benefit from Intel Turbo Boost technology being disabled. This patch sets the 'feature.node.kubernetes.io/cpu-pstate.turbo' label to 'false' if we can detect that it has been disabled. If detection fails no label is published.
44 lines
1.3 KiB
Go
44 lines
1.3 KiB
Go
/*
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Copyright 2017 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package cpu
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import (
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"fmt"
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"io/ioutil"
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"runtime"
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)
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// Discover p-state related features such as turbo boost.
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func detectPstate() (map[string]string, error) {
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// On other platforms, the frequency boost mechanism is software-based.
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// So skip pstate detection on other architectures.
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if runtime.GOARCH != "amd64" && runtime.GOARCH != "386" {
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return nil, nil
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}
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// Only looking for turbo boost for now...
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bytes, err := ioutil.ReadFile("/sys/devices/system/cpu/intel_pstate/no_turbo")
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if err != nil {
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return nil, fmt.Errorf("can't detect whether turbo boost is enabled: %s", err.Error())
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}
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features := map[string]string{"turbo": "false"}
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if bytes[0] == byte('0') {
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features["turbo"] = "true"
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}
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return features, nil
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}
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