linux-kernel - Re: [PATCH -mm] make swapin readahead skip over holes

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Date:	Wed, 11 Jan 2012 03:05:19 -0500
From:	KOSAKI Motohiro <kosaki.motohiro@...il.com>
To:	Rik van Riel <riel@...hat.com>
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	akpm@...ux-foundation.org, Mel Gorman <mel@....ul.ie>,
	Johannes Weiner <hannes@...xchg.org>
Subject: Re: [PATCH -mm] make swapin readahead skip over holes

2012/1/11 KOSAKI Motohiro <kosaki.motohiro@...il.com>:
>> Also, I doubt current swap_cluster default is best value on nowadays.
>
> I meant, current average hdd spec is,
>  - average seek time: 8.5ms
>  - sequential access performance: about 60MB/sec
>
> so, we can eat free lunch up to 7MB ~= 60(MB/sec) * 1000 / 8.5(ms).

Bah! I'm moron.
the correct fomura is,

500KB = 60(MB/sec) / 1000(msec/ssec) *8.5 (ms)
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