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SubjectRe: [PATCH 1/8] block: limit default readahead size for small devices
On Mon, Nov 21, 2011 at 05:00:04AM -0500, Christoph Hellwig wrote:
> On Mon, Nov 21, 2011 at 05:18:20PM +0800, Wu Fengguang wrote:
> > Given that the non-rotational attribute is not always reported, we can
> > take disk size as a max readahead size hint. This patch uses a formula
> > that generates the following concrete limits:
>
> Given that you mentioned the rotational flag and device size in this
> mail, as well as benchmarking with an intel SSD - did you measure
> how useful large read ahead sizes still are with highend Flash device
> that have extremly high read IOP rates?

The more the IOPs the larger the "window" you need to keep everything
going I suspect.

-Andi
--
ak@linux.intel.com -- Speaking for myself only.


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