Would greater performance be seen by reading from a block device in its
native block size, or by increasing the block size to PAGE_SIZE? Or is
there even any difference in performance between logical block sizes at
all? (And we are still supposed to use buffer_head, right? I can't see
anything other than drivers using bio, and filesystems are still using
sb_bread and such.)
And is there any way to increase the kernel-internal sector size? The ext4
development site says the maximum filesystem size addressable should be
(filesystem-block-size * 2^64) but LDD3 says the maximum device size a
driver can report is (512 * 2^64-1). (That should really be max sector
number, not max size, because capacity 0 is useless and would allow 2^64
sectors to be addressed fully. As a side note.)
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