On Wed, 2014-01-22 at 11:50 -0800, Andrew Morton wrote: +AD4- On Wed, 22 Jan 2014 11:30:19 -0800 James Bottomley +ADw-James.Bottomley+AEA-hansenpartnership.com+AD4- wrote: +AD4- +AD4- +AD4- But this, I think, is the fundamental point for debate. If we can pull +AD4- +AD4- alignment and other tricks to solve 99+ACU- of the problem is there a need +AD4- +AD4- for radical VM surgery? Is there anything coming down the pipe in the +AD4- +AD4- future that may move the devices ahead of the tricks? +AD4- +AD4- I expect it would be relatively simple to get large blocksizes working +AD4- on powerpc with 64k PAGE+AF8-SIZE. So before diving in and doing huge +AD4- amounts of work, perhaps someone can do a proof-of-concept on powerpc +AD4- (or ia64) with 64k blocksize. Maybe 5 drives in raid5 on MD, with 4K coming from each drive. Well aligned 16K IO will work, everything else will about the same as a rmw from a single drive. -chris -- 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/ . Don't email: <a href