Testing NVME Split BIO

[Sam Bradshaw (sbradshaw)]

> -----Original Message-----
> From: Linux-nvme [mailto:linux-nvme-bounces at lists.infradead.org] On
> Behalf Of Andrey Kuzmin
> Sent: Wednesday, December 03, 2014 11:27 AM
> To: Jeffrey Lien
> Cc: Sam Bradshaw (sbradshaw); linux-nvme at lists.infradead.org
> Subject: Re: Testing NVME Split BIO
> 
> Assuming an NVME device/namespace formatted with 4K block size, I'd
> give a shot to allocating, say, 8K in user-space with memalign (so that
> my virtual 8K occupy exactly 2 physical pages), and then issuing a 4K
> write to the respective nvme block device using any offset into the
> allocated memory you'd like, such as 2K suggested by Sam in that other
> email.
> Regards,
> Andrey

Using this approach, you'll still end up with a virtually contiguous block, which won't be split.