Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Thu, 14 Feb 2002 19:57:27 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Thu, 14 Feb 2002 19:57:18 -0500 Received: from 216-42-72-167.ppp.netsville.net ([216.42.72.167]:17577 "EHLO roc-24-169-102-121.rochester.rr.com") by vger.kernel.org with ESMTP id ; Thu, 14 Feb 2002 19:57:10 -0500 Date: Thu, 14 Feb 2002 19:56:52 -0500 From: Chris Mason To: reiserfs-list@namesys.com cc: linux-kernel@vger.kernel.org, axboe@suse.de Subject: Re: [PATCH] write barriers for 2.4.x Message-ID: <3728070000.1013734612@tiny> In-Reply-To: <3132400000.1013646727@tiny> In-Reply-To: <20020213222535.C0A45E64F2@ns1.suse.com> <3100680000.1013644053@tiny> <20020213235651.AC212E6360@ns1.suse.com> <3132400000.1013646727@tiny> X-Mailer: Mulberry/2.1.0 (Linux/x86) MIME-Version: 1.0 Content-Type: multipart/mixed; boundary="==========798283245==========" Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org --==========798283245========== Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Content-Disposition: inline Hello everyone, Here's the full patch update. The aic7xxx code is changed to make sure we only try to use tag commands when they are turned on for the target, otherwise we can safely assume the drive won't do other writes first. The buslogic and sym53c8xx_2 code is included, and the reiserfs code is updated to queue the commit block immediately after the last log block when barrier mode is enabled. It wasn't happening soon enough with the first patch, and the drive wasn't getting the chance to flush the commit as a unit. reiserfs was also changed back to waiting on the buffers. benchmarks don't show dropping the waits actually made any speed difference, the really critical wait that was hurting us was: write X log blocks wait write 1 commit block wait With -o barrier, this is now: write X log blocks write 1 commit block wait. For scsi, the new code is about 10% faster on journal heavy stuff, but you've really gotta hammer on the log to see it. Patch is attached and against 2.4.18-pre9 (rc1 should be fine) -chris --==========798283245========== Content-Type: application/x-gunzip; name="queue-barrier-5.diff.gz" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="queue-barrier-5.diff.gz"; size=7727 H4sICN9abDwAA3F1ZXVlLWJhcnJpZXItNS5kaWZmAMRceXPbRrL/G/oUE22tFhRJiZcuKlKsg7aY yJJDSnG2Nu+hQGBIwgYBGoeOtb2f/XX3HAB4SbafvaqKSWKme2Z6+vh1zyCuNxyyahpdsWqVPzh+ 6vKjza0w8ka5B74XpA9b0+hd7tnWJjxwYstOH5hu38Jv8Vajse1G3h2P4u2BHzrvt7nP7+wkjLac rO/SLmvVavVLWBo3KWdX4R1ju6y+027ttZsHrFGr1dfK5fIzxjNuxil7yQes3mL1g3Zzp10j+sba ixesur9X2WVl+LfeYC9erDHDiJModRIW8Q8pjxO2aVnRB3bEBv57l99ZPEiiRysJLdlu0oPS4RpD 2u3NtbJhsE12z5ljByzgXjLmEZvwaMRZEEbMC2IeJWzAh2HEt++hmdls6KfxWFBu44c3ZCYOWz12 Jq419O1RzDZY73frba9707Gue+edXue8hF2NQcTt94drZfwBwzMaPvYmU/+RrdsjLxits3ColhPD BBh8S7nouY0f2XBKalaM3QOHw1b9fMRqJZJVfWcHhVXfrWtp0epBOhtATGytMbddkIZxP/Z8zkxT 9aDP6vE04ncl9tMRw34l9vEbJK6W/F+SOCuKDuhwWdF9CZ8bThgkoJr8cM39ISbo+1Z0b4HIVthg 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