From mboxrd@z Thu Jan 1 00:00:00 1970 From: Vladislav Bolkhovitin Subject: [PATCH][SCST]: Update of text in SCST README about barriers usage Date: Mon, 26 Jan 2009 21:19:18 +0300 Message-ID: <497DFEA6.1080108@vlnb.net> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Return-path: Received: from moutng.kundenserver.de ([212.227.126.177]:59762 "EHLO moutng.kundenserver.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751613AbZAZSTM (ORCPT ); Mon, 26 Jan 2009 13:19:12 -0500 Sender: linux-scsi-owner@vger.kernel.org List-Id: linux-scsi@vger.kernel.org To: linux-scsi@vger.kernel.org Cc: linux-kernel@vger.kernel.org, scst-devel@lists.sourceforge.net This patch updates text in SCST README about barriers usage Signed-off-by: Vladislav Bolkhovitin README | 11 +++++------ 1 file changed, 5 insertions(+), 6 deletions(-) Index: scst/README =================================================================== --- scst/README (revision 641) +++ scst/README (working copy) @@ -607,12 +607,11 @@ IMPORTANT: By default for performance re On Linux initiators for EXT3 and ReiserFS file systems the barrier protection could be turned on using "barrier=1" and "barrier=flush" mount options correspondingly. Note, that - usually it turned off by default and the status of barriers - usage isn't reported anywhere in the system logs as well as - there is no way to know it on the mounted file system (at - least no known one). Windows and, AFAIK, other UNIX'es don't - need any special explicit options and do necessary barrier - actions on write-back caching devices by default. Also note + usually it's turned off by default (see http://lwn.net/Articles/283161). + You can check if it's turn on or off by looking in /proc/mounts. + Windows and, AFAIK, other UNIX'es don't need any special + explicit options and do necessary barrier actions on + write-back caching devices by default. Also note that on some real-life workloads write through caching might perform better, than write back one with the barrier protection turned on.