From owner-freebsd-fs@FreeBSD.ORG Thu May 8 19:26:54 2008 Return-Path: Delivered-To: freebsd-fs@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id B6956106566C; Thu, 8 May 2008 19:26:54 +0000 (UTC) (envelope-from peter.schuller@infidyne.com) Received: from smtp.infidyne.com (ds9.infidyne.com [88.80.6.206]) by mx1.freebsd.org (Postfix) with ESMTP id 6EF3F8FC18; Thu, 8 May 2008 19:26:54 +0000 (UTC) (envelope-from peter.schuller@infidyne.com) Received: from c-a916e555.03-51-73746f3.cust.bredbandsbolaget.se (c-a916e555.03-51-73746f3.cust.bredbandsbolaget.se [85.229.22.169]) by smtp.infidyne.com (Postfix) with ESMTPSA id 325788C0A1; Thu, 8 May 2008 21:10:09 +0200 (CEST) From: Peter Schuller To: freebsd-fs@freebsd.org Date: Thu, 8 May 2008 21:11:03 +0200 User-Agent: KMail/1.9.7 References: <48142ABE.4050107@psg.com> <20080428083133.GA81628@eos.sc1.parodius.com> <9bbcef730804280145x6961c43ekab916ec289396361@mail.gmail.com> In-Reply-To: <9bbcef730804280145x6961c43ekab916ec289396361@mail.gmail.com> MIME-Version: 1.0 Content-Type: multipart/signed; boundary="nextPart7422846.eyZcgVXkOY"; protocol="application/pgp-signature"; micalg=pgp-sha1 Content-Transfer-Encoding: 7bit Message-Id: <200805082111.12655.peter.schuller@infidyne.com> Cc: Randy Bush , Ivan Voras Subject: Re: zfs and vfs.zfs.prefetch_disable="1" X-BeenThere: freebsd-fs@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Filesystems List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 08 May 2008 19:26:54 -0000 --nextPart7422846.eyZcgVXkOY Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Content-Disposition: inline > The change you reference is apparently about zil_disable, which wasn't > removed, just moved. But the prefetch_disable setting was added and > removed a couple of times to the page, the latest being that it was > added since Pawel uses it in his post. I don't know whether this has changed, but at least some people reported th= at=20 prefetch caused very poor streaming performance. I had the same problem=20 (e.g., more or less unable to play a movie) until I disabled it. I have, however, not tried re-enabling it with newer versions (this was fro= m=20 the earlier days of ZFS in current). =2D-=20 / Peter Schuller PGP userID: 0xE9758B7D or 'Peter Schuller ' Key retrieval: Send an E-Mail to getpgpkey@scode.org E-Mail: peter.schuller@infidyne.com Web: http://www.scode.org --nextPart7422846.eyZcgVXkOY Content-Type: application/pgp-signature; name=signature.asc Content-Description: This is a digitally signed message part. -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.8 (FreeBSD) iEYEABECAAYFAkgjUFAACgkQDNor2+l1i30sQwCgicUzGGHEgNp+2/wxIAq7ynl4 PmcAoIo5cK12cKo4ns8xtJQpOMC2YeZl =U9yT -----END PGP SIGNATURE----- --nextPart7422846.eyZcgVXkOY--