From owner-freebsd-current@FreeBSD.ORG Tue Apr 17 20:51:38 2007 Return-Path: X-Original-To: freebsd-current@freebsd.org Delivered-To: freebsd-current@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52]) by hub.freebsd.org (Postfix) with ESMTP id 5B34C16A403 for ; Tue, 17 Apr 2007 20:51:38 +0000 (UTC) (envelope-from max@love2party.net) Received: from moutng.kundenserver.de (moutng.kundenserver.de [212.227.126.171]) by mx1.freebsd.org (Postfix) with ESMTP id DFCED13C4DA for ; Tue, 17 Apr 2007 20:51:37 +0000 (UTC) (envelope-from max@love2party.net) Received: from [88.64.191.130] (helo=amd64.laiers.local) by mrelayeu.kundenserver.de (node=mrelayeu8) with ESMTP (Nemesis), id 0ML31I-1HdueF16Lo-00065f; Tue, 17 Apr 2007 22:51:35 +0200 From: Max Laier Organization: FreeBSD To: freebsd-current@freebsd.org Date: Tue, 17 Apr 2007 22:51:23 +0200 User-Agent: KMail/1.9.5 References: <200704171143.l3HBhDZB008693@peedub.jennejohn.org> <200704172137.11184.Thomas.Sparrevohn@btinternet.com> In-Reply-To: <200704172137.11184.Thomas.Sparrevohn@btinternet.com> X-Face: ,,8R(x[kmU]tKN@>gtH1yQE4aslGdu+2]; R]*pL,U>^H?)gW@49@wdJ`H<=?utf-8?q?=25=7D*=5FBD=0A=09U=5For=3D=5CmOZf764=26nYj=3DJYbR1PW0ud?=>|!~,,CPC.1-D$FG@0h3#'5"k{V]a~.<=?utf-8?q?mZ=7D44=23Se=7Em=0A=09Fe=7E=5C=5DX5B=5D=5Fxj?=(ykz9QKMw_l0C2AQ]}Ym8)fU MIME-Version: 1.0 Content-Type: multipart/signed; boundary="nextPart27369945.4msuNq8cIk"; protocol="application/pgp-signature"; micalg=pgp-sha1 Content-Transfer-Encoding: 7bit Message-Id: <200704172251.33377.max@love2party.net> X-Provags-ID: V01U2FsdGVkX1+MLdDFcj6y7OdYqO992Srktqm7ybuA+7fi15s XSJ0C/kwMzTY0pQRQZsQrXcDQa1VMfDWzWL2kyVM1YKx6KbJa4 aP5MiuscgfXY4rPY3bywA== Cc: Thomas Sparrevohn Subject: Re: Some comments on ZFS X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 17 Apr 2007 20:51:38 -0000 --nextPart27369945.4msuNq8cIk Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Content-Disposition: inline On Tuesday 17 April 2007 22:37, Thomas Sparrevohn wrote: > On Tuesday 17 April 2007 12:43:13 Gary Jennejohn wrote: > > Robert Watson writes: > > > > Interestingly enough, I see less memory pressure since switching to > > ZFS. But I'm not using RAIDZ. Previously ``make buildworld'' would > > use much more memory, probably for buffer caching. It looks like ZFS > > doesn't use nearly as much buffer cache as UFS (which may not be a > > good thing). > > On this system 4GB system - 2,3GB available - ZFS stops around > 1,3GB Free whereas UFS continues until app. 700MB mark on a > buildworld > > But the price seems to be much more disk activity - Given that > the difference - after disabling Witness - was > > UFS 10m32.10s real 27m1.32s user 7m49.01s sys =20 > (Systat 700MB Free) ZFS 17m43.66s real 27m30.70s user =20 > 17m28.47s sys (Systat 1,3GB Free) > > It make me think that ZFS is trading memory for performance - my guess > is - that given the same memory usage ZFS would be unbeatable - I must > say that Pawel has done a great job porting ZFS I have reverted the 3/4 -> 1/2 arc size limit locally, which gives better=20 results in my test: playing hd video off the same disk while doing a=20 (single threaded) buildworld from the same zpool (single disk, no mirror,=20 no raidz). With the 1/2 limit, I get frequent hick-ups in the playback -=20 while with 3/4 things run (almost) smoothly. =2D-=20 /"\ Best regards, | mlaier@freebsd.org \ / Max Laier | ICQ #67774661 X http://pf4freebsd.love2party.net/ | mlaier@EFnet / \ ASCII Ribbon Campaign | Against HTML Mail and News --nextPart27369945.4msuNq8cIk Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.6 (FreeBSD) iD8DBQBGJTNVXyyEoT62BG0RAlIlAJ0SNN5l5aVD0Jgr73ueujocU98ixQCfab+P 5WztqX9y9yN68vHOZDk7wTY= =K0So -----END PGP SIGNATURE----- --nextPart27369945.4msuNq8cIk--