wiki:jazz/Performance_Tuning

Version 6 (modified by jazz, 15 years ago) (diff)

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Performance Tuning

System Performance Tuning : Memory

  • Share Memory 
    echo "kernel.shmall = 796917578" >> /etc/sysctl.conf
echo "kernel.shmmax = 796917578" >> /etc/sysctl.conf
echo "kernel.shmmni = 4096"      >> /etc/sysctl.conf

System Performance Tuning : File System

  • /etc/security/limits.conf - 每個程序(process)可以開啟檔案的個數(number limits of open files per process)

    • /etc/security/limits.conf

      old new  
      4949#ftp             -       chroot          /ftp
      5050#@student        -       maxlogins       4
      5151
       52*      soft        nofile        8192
       53
      5254# End of file

I/O Performance Tuning : NFS

  • NFS Tuning - /etc/fstab 
    192.168.0.111:/home /home nfs rw,bg,soft,intr,rsize=262144,wsize=262144 0 4
192.168.0.111:/opt  /opt  nfs ro,bg,soft,intr,rsize=262144,wsize=262144 0 4
192.168.0.111:/usr  /usr  nfs ro,bg,soft,intr,rsize=262144,wsize=262144 0 4

Network Performance Tuning

  • TCP Tuning 
    echo 262144               > /proc/sys/net/core/rmem_default
echo 8388608              > /proc/sys/net/core/wmem_max
echo 8388608              > /proc/sys/net/core/rmem_max
echo "4096 87380 4194304" > /proc/sys/net/ipv4/tcp_rmem
echo "4096 65536 4194304" > /proc/sys/net/ipv4/tcp_wmem

Power Management

  • 啟動 SATA ALPM 電源管理功能 - ​powertop 提供之建議 
    echo min_power > /sys/class/scsi_host/host0/link_power_management_policy