Re: [PATCH] fix readahead pipeline break caused by block plug

From: Christoph Hellwig
Date: Wed Feb 01 2012 - 04:18:16 EST

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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