From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from psmtp.com (na3sys010amx153.postini.com [74.125.245.153]) by kanga.kvack.org (Postfix) with SMTP id 6B92B6B005C for ; Wed, 11 Jan 2012 03:05:41 -0500 (EST) Received: by yhoo21 with SMTP id o21so216713yho.14 for ; Wed, 11 Jan 2012 00:05:40 -0800 (PST) MIME-Version: 1.0 In-Reply-To: References: <20120109181023.7c81d0be@annuminas.surriel.com> <4F0B7D1F.7040802@gmail.com> <4F0BABE0.8080107@redhat.com> From: KOSAKI Motohiro Date: Wed, 11 Jan 2012 03:05:19 -0500 Message-ID: Subject: Re: [PATCH -mm] make swapin readahead skip over holes Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Sender: owner-linux-mm@kvack.org List-ID: To: Rik van Riel Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, akpm@linux-foundation.org, Mel Gorman , Johannes Weiner 2012/1/11 KOSAKI Motohiro : >> Also, I doubt current swap_cluster default is best value on nowadays. > > I meant, current average hdd spec is, > =A0- average seek time: 8.5ms > =A0- sequential access performance: about 60MB/sec > > so, we can eat free lunch up to 7MB ~=3D 60(MB/sec) * 1000 / 8.5(ms). Bah! I'm moron. the correct fomura is, 500KB =3D 60(MB/sec) / 1000(msec/ssec) *8.5 (ms) -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: email@kvack.org