Date: Thu, 8 May 2008 21:11:03 +0200 From: Peter Schuller <peter.schuller@infidyne.com> To: freebsd-fs@freebsd.org Cc: Randy Bush <randy@psg.com>, Ivan Voras <ivoras@freebsd.org> Subject: Re: zfs and vfs.zfs.prefetch_disable="1" Message-ID: <200805082111.12655.peter.schuller@infidyne.com> In-Reply-To: <9bbcef730804280145x6961c43ekab916ec289396361@mail.gmail.com> References: <48142ABE.4050107@psg.com> <20080428083133.GA81628@eos.sc1.parodius.com> <9bbcef730804280145x6961c43ekab916ec289396361@mail.gmail.com>
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--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 <peter.schuller@infidyne.com>' 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--
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