On Tue, Jan 31, 2012 at 10:36:53PM -0500, Vivek Goyal wrote:

I still see that IO is being submitted one page at a time. The only
real difference seems to be that queue unplug happening at random times
and many a times we are submitting much smaller requests (40 sectors, 48
sectors etc).

This is expected given that the block device node uses
block_read_full_page, and not mpage_readpage(s).

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