wiki:jazz/11-04-04

Version 2 (modified by jazz, 14 years ago) (diff)

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2011-04-04

VMWare Server : IOWait Performance Tuning

  • 因為經常遇到 IOWait 的問題，所以找一下別人是怎麼解決的。
  • <參考> ​Gutsy and Vmware-Server – you’re in for some pain
  • 首先修改 /etc/vmware/config 
    --- /etc/vmware/config.bak	2011-04-04 22:21:13.000000000 +0800
+++ /etc/vmware/config	2011-04-06 10:20:42.000000000 +0800
@@ -22,4 +22,7 @@
 product.name = "VMware Server"
 # Beginning of the block added by the VMware VIX software
 vix.libdir = "/usr/lib/vmware-vix/lib"
+# 11-04-04: Enhance performance - by Jazz
+prefvmx.useRecommendedLockedMemSize = "TRUE"
+prefvmx.minVmMemPct = "100"
 # End of the block added by the VMware VIX software
  • 其次修改經常發生 IOWait 的虛擬機器 vmx 設定檔

    • Trac_Pool.vmx

      old new  
      4949debugStub.linuxOffsets = "0x0,0xffffffff,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0"
      5050
      5151extendedConfigFile = "Trac_Pool.vmxf"
       52
       53sched.mem.pshare.enable = "FALSE"
       54mainMem.useNamedFile = "FALSE"
       55MemTrimRate = "0"
       56MemAllowAutoScaleDown = "FALSE"
  • 另外，不確定是否因為我用單檔 VMDK 所以造成記憶體的 filesytem cache 太高，所以定期用 crontab 清掉一些 cache 
    0 * * * * /usr/sbin/ntpdate-debian > /dev/null 2>&1
0 * * * * echo 1 > /proc/sys/vm/drop_caches
1 * * * * echo 3 > /proc/sys/vm/drop_caches