Re: [00/17] Large Blocksize Support V3

From: William Lee Irwin III
Date: Thu Apr 26 2007 - 10:53:03 EST

On Thu, Apr 26, 2007 at 05:42:17PM +1000, Nick Piggin wrote:
> Actually, I don't know why people are so excited about being able to
> use higher order allocations (I would rather be more excited about
> never having to use them). But for those few places that really need
> it, I'd rather see them use a virtually mapped kernel with proper
> defragmentation rather than putting hacks all through the core code.

In memory as on disk, contiguity matters a lot for performance.

On Thu, Apr 26, 2007 at 05:42:17PM +1000, Nick Piggin wrote:
> I don't think that it is solved, and I think the heuristics that are
> there would be put under more stress if they become widely used. And
> it isn't only about whether we can get the page or not, but also about
> the cost. Look up Linus's arguments about page colouring, which are
> similar and I also think are pretty valid.

Perhaps broader exposure would help demonstrate their efficacy, or
otherwise discover what deficits need to be addressed.

-- wli
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