Messages in this thread | | | From | Chris Mason <> | Subject | Re: [Lsf-pc] [LSF/MM TOPIC] really large storage sectors - going beyond 4096 bytes | Date | Wed, 22 Jan 2014 20:13:20 +0000 |
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On Wed, 2014-01-22 at 11:50 -0800, Andrew Morton wrote: > On Wed, 22 Jan 2014 11:30:19 -0800 James Bottomley <James.Bottomley@hansenpartnership.com> wrote: > > > But this, I think, is the fundamental point for debate. If we can pull > > alignment and other tricks to solve 99% of the problem is there a need > > for radical VM surgery? Is there anything coming down the pipe in the > > future that may move the devices ahead of the tricks? > > I expect it would be relatively simple to get large blocksizes working > on powerpc with 64k PAGE_SIZE. So before diving in and doing huge > amounts of work, perhaps someone can do a proof-of-concept on powerpc > (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
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