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Old 12-22-2010, 12:26 AM   #1
priyadarshan
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Registered: Feb 2009
Location: Ahmedabad, Gujarat, India
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Disabling FS and Kernel caching


Hi,

I am working on deriving performance test of different interfaces on board... I am using iozone as utility to perform performance test...

The hurdle I am having is I am getting read speed of USB 2.0 interface as 300MB/ sec... although as per the USB 2.0 specs highest speed is 60 MB/ Sec...

Googling through the details I found that kernel or FS (I dont know who) is caching the file contents at the time of writing the file... which leads to this problem...

Can anyone please provide the solution to disabling such things or any other option that can leas to true performance tests...
 
Old 12-22-2010, 12:50 AM   #2
syg00
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I would be most surprised if it didn't support direct I/O. What does the documentation say ?.
 
Old 12-22-2010, 02:26 AM   #3
priyadarshan
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Registered: Feb 2009
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Yeah I found it... -I option makes it possible...

By d way... after direct I/O options made available... are they still any limiting factors for performance mesurements???...
May be Disk's hardware cache or any thing else that comes in your mind?
 
  


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