As the end of the 1990s approached, a lot of kernel-development effort was going into improving support for 32-bit systems
with shockingly large amounts of memory installed. This being the 1990s, having more than 1GB of memory in such a system was deemed to be shocking.
Many of the compromises made to support such inconceivably large systems
have remained in the kernel to this day. One of those compromises -
bounce buffering of I/O requests in the block layer - has finally been
eased out for the 6.16 release, more than a quarter-century after its introduction.
https://lwn.net/Articles/1022655/
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