From owner-freebsd-hackers@FreeBSD.ORG Thu Dec 10 16:05:26 2009 Return-Path: Delivered-To: freebsd-hackers@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 5BAA2106566C for ; Thu, 10 Dec 2009 16:05:26 +0000 (UTC) (envelope-from chris@brueffer.de) Received: from moutng.kundenserver.de (moutng.kundenserver.de [212.227.17.9]) by mx1.freebsd.org (Postfix) with ESMTP id C3BE98FC17 for ; Thu, 10 Dec 2009 16:05:25 +0000 (UTC) Received: from brueffer.de (host1.allnav.ch [212.55.212.50]) by mrelayeu.kundenserver.de (node=mrbap0) with ESMTP (Nemesis) id 0MbJMy-1NbX9i24cG-00JGsn; Thu, 10 Dec 2009 16:52:35 +0100 Received: by brueffer.de (Postfix, from userid 1001) id 512CC17040; Thu, 10 Dec 2009 16:52:27 +0100 (CET) Date: Thu, 10 Dec 2009 16:52:27 +0100 From: Christian Brueffer To: Mel Flynn Message-ID: <20091210155226.GA59257@serenity> References: <237c27100911260714x2fcb194ew1e6ce11e764efd08@mail.gmail.com> <867htduvwh.fsf@ds4.des.no> <237c27100911260911w2674b79ds8ac447e900324dce@mail.gmail.com> <200912071620.03371.mel.flynn+fbsd.hackers@mailing.thruhere.net> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="gBBFr7Ir9EOA20Yy" Content-Disposition: inline In-Reply-To: <200912071620.03371.mel.flynn+fbsd.hackers@mailing.thruhere.net> X-Operating-System: FreeBSD 9.0-CURRENT X-PGP-Key: http://people.FreeBSD.org/~brueffer/brueffer.key.asc X-PGP-Fingerprint: A5C8 2099 19FF AACA F41B B29B 6C76 178C A0ED 982D User-Agent: Mutt/1.5.19 (2009-01-05) X-Provags-ID: V01U2FsdGVkX1/cqM0WtsiP9G58YILp5pNbQumwHLi0U+EK2QP HeA1sflu+cA3zDw0HSSpmqtwSjMv4Qv/QGWtpl4aNlcJ8wwjSi PkWf4uW8SVFn4QgZCba8wAQ9Pu6kqeO Cc: freebsd-hackers@freebsd.org, Linda Messerschmidt Subject: Re: Superpages on amd64 FreeBSD 7.2-STABLE X-BeenThere: freebsd-hackers@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Technical Discussions relating to FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 10 Dec 2009 16:05:26 -0000 --gBBFr7Ir9EOA20Yy Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Mon, Dec 07, 2009 at 04:20:03PM +0100, Mel Flynn wrote: > On Thursday 26 November 2009 18:11:10 Linda Messerschmidt wrote: >=20 > > I did not mean to suggest that we were asking for help solving a > > problem with squid rotation. I provided that information as > > background to discuss what we observed as a potential misbehavior in > > the new VM superpages feature, in the hope that if there is a problem > > with the new feature, we can help find/resolve it or, if this is > > working as intended, hopefully gain some insight as to what's going > > on. >=20 > I tend to agree with this, though I don't know the nitty gritty of the=20 > implementation, it seems that: > a) superpages aren't copied efficiently (at all?) on fork and probably ot= her=20 > workloads > b) vfork is encouraged for memory intensive applications, yet: > BUGS > This system call will be eliminated when proper system sharing mecha= nisms > are implemented. Users should not depend on the memory sharing sema= ntics > of vfork() as it will, in that case, be made synonymous to fork(2). >=20 FYI, this comment has been removed a couple of weeks ago in HEAD and the STABLE branches. - Christian --=20 Christian Brueffer chris@unixpages.org brueffer@FreeBSD.org GPG Key: http://people.freebsd.org/~brueffer/brueffer.key.asc GPG Fingerprint: A5C8 2099 19FF AACA F41B B29B 6C76 178C A0ED 982D --gBBFr7Ir9EOA20Yy Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.9 (FreeBSD) iEYEARECAAYFAkshGToACgkQbHYXjKDtmC1oEgCdF6W6Xt2lfK+HBdiIv+Vc/5XG jgYAn2OULbuj8pPu9AMNlJRGBCdbx4Gr =YPjW -----END PGP SIGNATURE----- --gBBFr7Ir9EOA20Yy--