From owner-freebsd-hackers@FreeBSD.ORG Tue Sep 19 17:34:22 2006 Return-Path: X-Original-To: freebsd-hackers@freebsd.org Delivered-To: freebsd-hackers@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 6DCF516A415 for ; Tue, 19 Sep 2006 17:34:22 +0000 (UTC) (envelope-from kris@obsecurity.org) Received: from elvis.mu.org (elvis.mu.org [192.203.228.196]) by mx1.FreeBSD.org (Postfix) with ESMTP id 1D57843D70 for ; Tue, 19 Sep 2006 17:34:22 +0000 (GMT) (envelope-from kris@obsecurity.org) Received: from obsecurity.dyndns.org (elvis.mu.org [192.203.228.196]) by elvis.mu.org (Postfix) with ESMTP id 0223F1A3C1F; Tue, 19 Sep 2006 10:34:22 -0700 (PDT) Received: by obsecurity.dyndns.org (Postfix, from userid 1000) id 57F27515F7; Tue, 19 Sep 2006 13:34:21 -0400 (EDT) Date: Tue, 19 Sep 2006 13:34:21 -0400 From: Kris Kennaway To: Dmitry Morozovsky Message-ID: <20060919173421.GA45928@xor.obsecurity.org> References: <200609141232.k8ECWTXj045191@lurza.secnetix.de> <20060919160511.T33371@woozle.rinet.ru> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="FCuugMFkClbJLl1L" Content-Disposition: inline In-Reply-To: <20060919160511.T33371@woozle.rinet.ru> User-Agent: Mutt/1.4.2.2i Cc: freebsd-hackers@freebsd.org Subject: Re: numbers don't lie ... 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: Tue, 19 Sep 2006 17:34:22 -0000 --FCuugMFkClbJLl1L Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Tue, Sep 19, 2006 at 04:11:12PM +0400, Dmitry Morozovsky wrote: > On Thu, 14 Sep 2006, Oliver Fromme wrote: >=20 > OF> Because buildworld is I/O-bound on systems with sufficiently > OF> fast processors. > OF>=20 > OF> Try putting the contents of /usr/src into a RAM disk and > OF> repeat the benchmark. The numbers might look a little > OF> different then. Of course, you should have sufficient RAM > OF> in the machines -- If they're going to swap to the disks, > OF> your benchmark won't be happy. > OF>=20 > OF> I think putting /usr/obj onto a RAM disk is _not_ necessary > OF> because of soft-updates, so the processes shouldn't block > OF> on writes. >=20 > My experiments show that if you have enough memory to host radmdrive for= =20 > /usr/src you'd better leave it for caching - there were no statistically > meaningful performance difference, at least on machines with 1G+ RAM. Really? My measurements show the opposite (on a system with 16GB of RAM). Kris --FCuugMFkClbJLl1L Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.5 (FreeBSD) iD8DBQFFECodWry0BWjoQKURAo5wAJ9oj/GoMfRtJa+zZngfoj+LvSrIzACffWzK TEXdE2mAQZ1G/aETqD3io/8= =LO+5 -----END PGP SIGNATURE----- --FCuugMFkClbJLl1L--