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hi, asias
    
    please check the attachment.

Best Regards

xigao

Created attachment 612088 [details]
iozone script

*** Bug 849944 has been marked as a duplicate of this bug. ***

There are three sets of tests that Xiaomei run:
1) with direct io
2) with small file < 0.9 system ram size 
3) with large file > 2.0 system ram size

The 'regression' we can is only in test 2). In this case, we are testing the I/O in ram instead of the real disk I/O. The result is not reliable nor stable. E.g the read speed in test 2) is 4883 MB/s while the read speed in test 1) is 101 MB/s.

This is not a regression, I am closing it.