环境:
- Red Hat Enterprise Linux 4
- Red Hat Enterprise Linux 5
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
On RHEL4:
configure the cpu speed to run at MAX speed all the time by adding the following parameter into the file /etc/cpuspeed.conf and restart the cpuspeed service:
vim /etc/cpuspeed.conf
插入或修改：
OPTS="$OPTS -n -C -S \"0 1\""
/etc/init.d/cpuspeed restart
On RHEL 5:
add the above parameters to /etc/sysconfig/cpuspeed or use the performance governor by adding the following parameter to the /etc/sysconfig/cpuspeed file and restart the cpuspeed service:
vim /etc/sysconfig/cpuspeed
插入或修改：
GOVERNOR=performance
/etc/init.d/cpuspeed restart
On RHEL 6:
configure the performance cpuspeed governor as above for RHEL 5 and add the following kernel boot options and restart the server. More information available in the Low Latency Performance Tuning for Red Hat Enterprise Linux 6 article.
/etc/init.d/cpuspeed stop # 开启性能模式
processor.max_cstate=1 intel_idle.max_cstate=0 idle=poll
On RHEL 7:
Red Hat recommends tuned profiles (which use the /dev/cpu_dma_latency interface) as they achieve measured equivalent performance without reboot requirement. More information available in the Low Latency Performance Tuning for Red Hat Enterprise Linux 7article.
yum install -y tuned # 安装tuned工具
systemctl start/stop tuned # 启动/停止tuned服务
systemctl enable/disable tuned # 自启动/禁止自启动
tuned服务的相关配置目录：
/usr/lib/tuned/ # 原生的性能模式
├── balanced
│ └── tuned.conf
├── desktop
│ └── tuned.conf
├── functions
├── latency-performance
│ └── tuned.conf
├── network-latency
│ └── tuned.conf
├── network-throughput
│ └── tuned.conf
├── powersave
│ ├── script.sh
│ └── tuned.conf
├── recommend.conf
├── throughput-performance
│ └── tuned.conf
├── virtual-guest
│ └── tuned.conf
└── virtual-host
└── tuned.conf
/etc/tuned # DIY的性能模式
├── active_profile # 当前的性能模式
├── bootcmdline
└── tuned-main.conf
tuned-adm list # 显示host上能运行的性能模式
Available profiles:
- balanced # 平衡模式
- desktop
- latency-performance # 低延迟的性能模式
- network-latency
- network-throughput
- powersave # 节能模式
- throughput-performance # 高吞吐量优化模式
- virtual-guest # 虚拟客人模式
- virtual-host
- oracle # oracle模式
常用模式介绍：
balanced
它的目的是成为性能和功耗之间的折衷。它试图尽量使用自动调节。它有好的结果对于大多数负载。唯一的缺点是增加了延迟。在当前调释放它使CPU、磁盘、音频和视频插件和激活ondemand调控器。radeon_powersave设置为自动。
latency-performance
低延迟的性能模式。它禁用电能节约机制,使sysctl设置提高延迟。CPU调节器将性能低的CPU锁定C状态(通过PM QoS)。
throughput-performance
高吞吐量优化模式。它禁用电能节约机制,使sysctl设置提高吞吐量性能的磁盘、网络IO和转向最后期限的调度器。CPU调试器设置为性能模式。
virtual-guest
基于企业存储配置文件,在其他任务,增加虚拟内存swappiness和减少磁盘预读值。它没有禁用磁盘屏障。
oracle
基于throughput-performance模式，它另外禁用透明的巨大的页面和修改内核参数相关的一些其他性能。这个配置文件是由tuned-profiles-oracle包。在6.8及以后版本可用。
tuned-adm active # 显示host的当前性能模式
- Current active profile: latency-performance
tuned-adm profile latency-performance # 切换至性能模式
tuned-adm off