mix-block size for raw_io ??

[BenHanokh Gabriel <gabriel@SANgate.com>]

hi

i saw that the raw interface is using 1/2K blocks for io.
i understand that raw_io needs to support disk accesses in sector 
resolution, but why is it not possible to mix block sizes for the same 
device -> giving a much better performance using something like:
---------------------
left_bytes    = io_size % 4K
bytes            = io_size - left_bytes

call brw_kiovec(bytes)         // using_4K_blocks
call brw_kiovec(left_bytes) // using_1/2K_blocks
----------------------

the brw_kiovec() doesn't seems to remember block_size between calls  as 
it calculates everything based on the block_size passed as parameter.

is there any reason why we don't use mix-block-size ?

please CC me for answers

THX
/Gabriel BenHanokh

--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org.  For more info on Linux MM,
see: http://www.linux.eu.org/Linux-MM/