From: Heiner Kallweit <hkallwe...@gmail.com>
Date: Sun, 20 Jan 2019 11:12:01 +0100
> 8 years ago, as part of 6f0333b8fde4 ("r8169: use 50% less ram for RX
> ring"), the alignment requirement for rx buffers was silently changed
> from 8 bytes to 16 bytes. I found nothing explaining this, also the
> chip specs I have only mention an 8 byte requirement.
> AFAICS kmalloc_node() guarantees allocated memory to be at least
> "long long" aligned, what is 8 bytes on a 32 bit machine.
> So we can take this memory as-is and avoid some overhead by changing
> the alignment requirement back to 8 bytes.
>
> Signed-off-by: Heiner Kallweit <hkallwe...@gmail.com>
Applied.
It might have been for cache line alignment or something silly like
that. But totally undocumented.
