| Date | Mon, 21 Nov 2011 05:00:04 -0500 | From | Christoph Hellwig <> | Subject | Re: [PATCH 1/8] block: limit default readahead size for small devices |
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On Mon, Nov 21, 2011 at 05:18:20PM +0800, Wu Fengguang wrote: > This looks reasonable: smaller device tend to be slower (USB sticks as > well as micro/mobile/old hard disks). > > 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?
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