Q: what exactly does SSD mode still do?

[Holger Hoffstätte <holger@xxxxxxxxxxxxxxxxxxxxxx>]

Hi,

could someone explain what SSD mode *actually* still does? Not ssd_spread,
that's clear and unrelated. A recent commit removed the thread-offloaded
bio submission (avoiding context switches etc.) - which I thought was the
reason for SSD mode? - and looking through the code I couldn't find any
bits that helped clarify the difference.

Thanks!
Holger