Messages in this thread | | | Date | Wed, 22 Jan 2014 11:50:02 -0800 | From | Andrew Morton <> | Subject | Re: [Lsf-pc] [LSF/MM TOPIC] really large storage sectors - going beyond 4096 bytes |
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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.
That way we'll at least have an understanding of what the potential gains will be. If the answer is "1.5%" then poof - go off and do something else.
(And the gains on powerpc would be an upper bound - unlike powerpc, x86 still has to fiddle around with 16x as many pages and perhaps order-4 allocations(?))
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