[RFC 0/3] Btrfs checksum offload

[Keith Busch]

On Wed, Jan 29, 2025 at 04:40:25PM +0100, Christoph Hellwig wrote:
> > 
> > Another potential benefit: if the device does the checksum, then I think
> > btrfs could avoid the stable page writeback overhead and let the
> > contents be changable all the way until it goes out on the wire.
> 
> If the device generates the checksum (aka DIF insert) that problem goes
> away.  But we also lose integrity protection over the wire, which would
> be unfortunate.

If the "wire" is only PCIe, I don't see why it matters. What kind of
wire corruption gets undetected by the protocol's encoding and LCRC that
would get caught by the host's CRC payload?