Date: Mon, 26 Mar 2012 19:03:42 +0200 From: Fabian Keil <freebsd-listen@fabiankeil.de> To: freebsd-fs@freebsd.org Subject: Re: NFSv3, ZFS, 10GE performance Message-ID: <20120326190342.0b78cbc8@fabiankeil.de> In-Reply-To: <alpine.GSO.2.01.1203261146200.22350@freddy.simplesystems.org> References: <4F703815.8070809@crashme.org> <jkpgt4$v55$1@dough.gmane.org> <4F709A18.50907@crashme.org> <alpine.GSO.2.01.1203261146200.22350@freddy.simplesystems.org>
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--Sig_/GAqmTSOICOxqnc/ZiWsvYw. Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: quoted-printable Bob Friesenhahn <bfriesen@simple.dallas.tx.us> wrote: > On Mon, 26 Mar 2012, Sven Brandenburg wrote: > > > > Hopefully, readahead doesn't kill performance for smaller files.. :-) >=20 > You are right to be concerned. There are plenty of cases where=20 > read-ahead damages application performance. Reading data which is=20 > never actually used is expensive. >=20 > It would be useful if FreeBSD would support posix_fadvise() so that=20 > applications can specify the type of access they will use, and if this=20 > advice can be used by NFS and the filesystem layer to decide if=20 > read-ahead should be used, and how much. posix_fadvise() is already available in FreeBSD 10.0-CURRENT. Fabian --Sig_/GAqmTSOICOxqnc/ZiWsvYw. Content-Type: application/pgp-signature; name=signature.asc Content-Disposition: attachment; filename=signature.asc -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.18 (FreeBSD) iEYEARECAAYFAk9woXEACgkQBYqIVf93VJ21HQCfbY2lvS2Nk31YdWC2S00WZH9x 9kwAoLd0l6a70JXXD774XJqnXSha++1o =dtoo -----END PGP SIGNATURE----- --Sig_/GAqmTSOICOxqnc/ZiWsvYw.--
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