From: KOSAKI Motohiro <kosaki.motohiro@gmail.com>
To: Rik van Riel <riel@redhat.com>
Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org,
akpm@linux-foundation.org, Mel Gorman <mel@csn.ul.ie>,
Johannes Weiner <hannes@cmpxchg.org>
Subject: Re: [PATCH -mm] make swapin readahead skip over holes
Date: Wed, 11 Jan 2012 03:05:19 -0500 [thread overview]
Message-ID: <CAHGf_=pnbOo6bGf3uxsCbn2YJ3XwpE79TDWdX2jRrUoE5Hkbdw@mail.gmail.com> (raw)
In-Reply-To: <CAHGf_=odfZxYS+PcMfeJ2ddFm76+-KbOLNrjGBtoEdExdQmL3Q@mail.gmail.com>
2012/1/11 KOSAKI Motohiro <kosaki.motohiro@gmail.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)
next prev parent reply other threads:[~2012-01-11 8:05 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-01-09 23:10 [PATCH -mm] make swapin readahead skip over holes Rik van Riel
2012-01-09 23:49 ` KOSAKI Motohiro
2012-01-10 3:09 ` Rik van Riel
2012-01-11 7:14 ` KOSAKI Motohiro
2012-01-11 8:01 ` KOSAKI Motohiro
2012-01-11 8:05 ` KOSAKI Motohiro [this message]
2012-01-11 14:11 ` John Stoffel
2012-01-11 19:17 ` Christoph Lameter
2012-01-11 21:03 ` John Stoffel
2012-01-11 22:25 ` KOSAKI Motohiro
2012-01-11 23:15 ` Andrew Morton
2012-01-11 16:51 ` Mel Gorman
2012-01-11 19:23 ` Rik van Riel
2012-01-12 14:33 ` Mel Gorman
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to='CAHGf_=pnbOo6bGf3uxsCbn2YJ3XwpE79TDWdX2jRrUoE5Hkbdw@mail.gmail.com' \
--to=kosaki.motohiro@gmail.com \
--cc=akpm@linux-foundation.org \
--cc=hannes@cmpxchg.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=mel@csn.ul.ie \
--cc=riel@redhat.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).