From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from len.romanrm.net ([176.31.121.172]:38048 "EHLO len.romanrm.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754282Ab3BENq2 (ORCPT ); Tue, 5 Feb 2013 08:46:28 -0500 Date: Tue, 5 Feb 2013 19:46:23 +0600 From: Roman Mamedov To: Tomasz Kusmierz Cc: Bernd Schubert , Chris Mason , "linux-btrfs@vger.kernel.org" Subject: Re: btrfs for files > 10GB = random spontaneous CRC failure. Message-ID: <20130205194623.07a9bcfd@natsu> In-Reply-To: <5110DC02.4030409@gmail.com> References: <50F3E77B.2030901@gmail.com> <20130114145904.GA1387@shiny> <50F422BC.4000901@gmail.com> <20130114155718.GC1387@shiny> <50F43319.9040009@gmail.com> <20130114163433.GD1387@shiny> <50F5E6FA.60803@gmail.com> <50F6712F.3070408@itwm.fraunhofer.de> <5110DC02.4030409@gmail.com> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=PGP-SHA1; boundary="Sig_/VcPE.PqaSOjYL1hK=uy6X.e"; protocol="application/pgp-signature" Sender: linux-btrfs-owner@vger.kernel.org List-ID: --Sig_/VcPE.PqaSOjYL1hK=uy6X.e Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: quoted-printable On Tue, 05 Feb 2013 10:16:34 +0000 Tomasz Kusmierz wrote: > that I was using one of those fantastic pci 4 port ethernet cards and=20 > printer was directly to it - after moving it and everything else to=20 > switch all problem and issues have went away. AT the moment I'm running=20 > server for 2 weeks without any corruptions, any random kernel btrfs=20 > crashes etc. If moving the printer over to a switch helped, perhaps it is indeed an electrical interference problem, but if your card is an old one from Sun, k= eep in mind that they also have some problems with DMA on machines with large amounts of RAM: "sunhme" experiences corrupt packets if machine has more than 2GB of memo= ry https://bugzilla.kernel.org/show_bug.cgi?id=3D10790 Not hard to envision a horror story scenario where a rogue network card wou= ld shred your filesystem buffer cache with network packets DMAed all over it, like bullets from a machine gun :) But in reality afaik IOMMU is supposed to protect against this. --=20 With respect, Roman --Sig_/VcPE.PqaSOjYL1hK=uy6X.e Content-Type: application/pgp-signature; name=signature.asc Content-Disposition: attachment; filename=signature.asc -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (GNU/Linux) iEYEARECAAYFAlERDS8ACgkQTLKSvz+PZwjL8QCfTO5/QtiYFb+cStWRJ4Pnw5ZR +dEAn1EpcA1O4gH+dEFsrxqMvbbVwoA0 =obRG -----END PGP SIGNATURE----- --Sig_/VcPE.PqaSOjYL1hK=uy6X.e--