From: Artem Bityutskiy Subject: Re: ext4 settings in an embedded system Date: Mon, 19 Nov 2012 12:42:15 +0200 Message-ID: <1353321735.20111.34.camel@sauron.fi.intel.com> References: <1352968933.2221.16.camel@sauron.fi.intel.com> <50A65E5D.7040305@redhat.com> Reply-To: dedekind1@gmail.com Mime-Version: 1.0 Content-Type: multipart/signed; micalg="pgp-sha1"; protocol="application/pgp-signature"; boundary="=-F4u/a1lHy9gxDs06ErQL" Cc: Andrey Sidorov , "Ohlsson, Fredrik (GE Healthcare, consultant)" , linux-ext4@vger.kernel.org To: Eric Sandeen Return-path: Received: from mga09.intel.com ([134.134.136.24]:10438 "EHLO mga09.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751248Ab2KSKlc (ORCPT ); Mon, 19 Nov 2012 05:41:32 -0500 In-Reply-To: <50A65E5D.7040305@redhat.com> Sender: linux-ext4-owner@vger.kernel.org List-ID: --=-F4u/a1lHy9gxDs06ErQL Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Fri, 2012-11-16 at 09:40 -0600, Eric Sandeen wrote: > Barriers were not made default on ext3 until 2011, in kernel v3.1, > astonishingly. So it makes sense that ext3 fared worse than ext4. Very probable, I do not remember if we had them. But we were testing on top of eMMC with not write-cache. Anyway, that was long time ago. While on it, one problem I remember in an unrelated testing of ext3 on top of eMMC was related to _read_ errors. Sometimes after an power cut eMMC returned an ECC error, so a sector could be unreadable. But after writing to this sector it became fine. ext3 and the tools treated a read error as fatal. However, in case of eMMC that was something "normal". I do not know how the situation changes since then, this was probably in 2009. --=20 Best Regards, Artem Bityutskiy --=-F4u/a1lHy9gxDs06ErQL Content-Type: application/pgp-signature; name="signature.asc" Content-Description: This is a digitally signed message part Content-Transfer-Encoding: 7bit -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (GNU/Linux) iQIcBAABAgAGBQJQqg0HAAoJECmIfjd9wqK0Jb0P/2m8U92rlBFeQBO2aEKsY//L P9XbmEwekhCN1FUpqewu0cjMt6trj5fsxXZNyW+ra/V2hiSdGCFlnEzVpF19UutE A5AFg4B73b6S6gjFX6FKetkAE1Pk0wS0gsCm7tes4li9eGtXoaEMIMuuz4xCzhNy a6v+l2ID1X/tr3OspxmQYPL6ocWfWL15VYUcIjgrW0dogKM/uIPfi/Wwb3rtR+X6 QuxpDVrukDSPTwT5wNynwmS0hIgheZ0Nuuf+kD9W3AWgtPvCUUGYtdxn9Oz6GHUJ NBaT1f8RYaQbZrL0JwKZp0f1YM0RozstJ+PpgqCbx12ua15MswYiFQ4jUfFK87/L gAcD2bz6pZCaz6wqoGquhtkxkELdBCNgceIjuaE7KN/9ej8MCYMjRGQ0VvdIAc6C je5KoQujA5USVTdL07vjNZjW+Vy3Tt7So3rVAF2xepV1H6wa2nqGa8IKyGOY40Bu ivkxJvab1RmuyEzX1tS5mz6vZdOH4SpOUWg63Jx2Ylo9pDi6euGCPtQOlQiVOXTy Vhfi8LkHmlZHFUI8DQhNAqzxPA4VaWA50laUKTObPsfh3gGK5jQm7bXZvrqyrncK jxw7c5MJXBrYWEmTRu1EhPqh9vWB4IKGdqU11xuoVHt1IAt4FXkOhpP0INSL43Vr dZjq28zzlHhL+swBwzBF =nZFl -----END PGP SIGNATURE----- --=-F4u/a1lHy9gxDs06ErQL--