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). -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>