Alignment

[gregoryyoung]

You hard code alignment in windows to 4096 you should either use http://msdn.microsoft.com/en-us/library/aa364935%28VS.85%29.aspx which gives the sector size or io control to get it instead http://msdn.microsoft.com/en-us/library/windows/desktop/aa363147(v=vs.85).aspx

Also some of the comments are wrong re disabling drive level caches directio does nothing with this the controller can still cache etc (and most do even if they are not safe!)

Cheers,

Greg

[ncw]

Thank you very much for your comments.

I chose the value 4096 as it is big enough for all current disks as is discussed here.

If you could propose a patch to change the 4096 constant, or fix any wording that would be an improvement.

Thanks

Nick

PS I'm not really a windows expert so any help appreciated!

[gregoryyoung]

No worries I'll pull later today. Are their instructions for test running etc? I only looked at the one file so forgive me if it's covered.

Cheers,

Greg

On Monday, November 3, 2014, Nick Craig-Wood [email protected] wrote:

Thank you very much for your comments.

I chose the value 4096 as it is big enough for all current disks as is discussed here http://msdn.microsoft.com/en-us/library/windows/desktop/cc644950(v=vs.85).aspx .

If you could propose a patch to change the 4096 constant, or fix any wording that would be an improvement.

Thanks

Nick

PS I'm not really a windows expert so any help appreciated!

— Reply to this email directly or view it on GitHub https://github.com/ncw/directio/issues/4#issuecomment-61476629.

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