In order to measure the flash benchmark, we set "devb-eide blk commit=high, alloc=0, cache=0, nora" and use read/write 
function calls )not fread/fwrite)to disable read-ahead and write-behind caching. 

For QNX 6.3.0 + SP3 + 6.3.2a installation, above approach can get different read/write benchmark for different IDE flash
.

However, in latest QNX 6.3.2 installation, above approach have same read benchmark and different write benchmark. It 
looks like write-behind disabled but read-ahead still enabled. Why?