From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1750843AbWIMRvP (ORCPT ); Wed, 13 Sep 2006 13:51:15 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1750846AbWIMRvP (ORCPT ); Wed, 13 Sep 2006 13:51:15 -0400 Received: from [212.33.187.119] ([212.33.187.119]:19328 "EHLO raad.intranet") by vger.kernel.org with ESMTP id S1750841AbWIMRvO (ORCPT ); Wed, 13 Sep 2006 13:51:14 -0400 From: Al Boldi To: Jens Axboe Subject: Re: What's in linux-2.6-block.git Date: Wed, 13 Sep 2006 20:52:48 +0300 User-Agent: KMail/1.5 Cc: linux-kernel@vger.kernel.org References: <200609131359.04972.a1426z@gawab.com> <200609131435.31390.a1426z@gawab.com> <20060913115615.GC4792@kernel.dk> In-Reply-To: <20060913115615.GC4792@kernel.dk> MIME-Version: 1.0 Content-Disposition: inline Content-Type: text/plain; charset="windows-1256" Content-Transfer-Encoding: 7bit Message-Id: <200609132052.48721.a1426z@gawab.com> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Jens Axboe wrote: > On Wed, Sep 13 2006, Al Boldi wrote: > > Jens Axboe wrote: > > > On Wed, Sep 13 2006, Al Boldi wrote: > > > > Jens Axboe wrote: > > > > > This lists the main features of the 'block' branch, which is bound > > > > > for Linus when 2.6.19 opens: > > > > > > > > > > - Splitting of request->flags into two parts: > > > > > - cmd type > > > > > - modified flags > > > > > Right now it's a bit of a mess, splitting this up invites a > > > > > cleaner usage and also enables us to implement generic "messages" > > > > > passed on the regular queue for the device. > > > > > > > > > > - Abstract out the request back merging and put it into the core > > > > > io scheduler layer. Cleans up all the io schedulers, and noop gets > > > > > merging for "free". > > > > > > > > > > - Abstract out the rbtree sorting. Gets rid of duplicated code in > > > > > as/cfq/deadline. > > > > > > > > > > - General shrinkage of the request structure. > > > > > > > > > > - Killing dynamic rq private structures in deadline/as/cfq. This > > > > > should speed up the io path somewhat, as we avoid allocating > > > > > several structures (struct request + scheduler private request) > > > > > for each io request. > > > > > > > > > > - meta data io logging for blktrace. > > > > > > > > > > - CFQ improvements. > > > > > > > > > > - Make the block layer configurable through Kconfig (David > > > > > Howells). > > > > > > > > > > - Lots of cleanups. > > > > > > > > Does it also address the strange "max_sectors_kb<>192 causes a > > > > 50%-slowdown" problem? > > > > > > (remember to cc me/others when replying, I can easily miss lkml > > > messages for several days otherwise). > > > > > > It does not, the investigation of that is still pending I'm afraid. > > > The data is really puzzling, I'm inclined to think it's drive related. > > > Are you reproducing it just one box/drive, or on several? > > > > Several boxes, same drive. > > Have you / can you try and reproduce with another drive as well? It'd be > an interesting data point. Not really, as this drive is the only one supporting max_sectors_kb>128. Thanks! -- Al