Re: Latest AIO patchset

[Hayim Shaul]

> 
> Some basic results are up comparing streaming non-cached random 
> AIO read/write throughputs for a single ext3 file using aio-stress 
> for various io sizes with and without these patches, and also 
> comparsions with O_DIRECT AIO throughputs. The short summary has
> been a doubling of throughput using the fsaio patches, which is
> also close to the results seen with O_DIRECT AIO.
> 
> As usual feedback, bug fixes, test results etc are welcome.
> 

What exactly is the O_DIRECT flag? When I add this flag to the open func
it fails.

More specificaly, this function fails
  open("filename", O_RDWR | O_DIRECT | O_LARGEFILE | O_CREAT, S_IRWXU);   

but this one succeeds
  open("filename", O_RDWR | O_LARGEFILE | O_CREAT, S_IRWXU);   

I'm running linux 2.6.0 with libaio 0.3.92.

   Hayim.

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