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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.

    -- -- Speaking for myself only.

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