From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753442AbaJQNPx (ORCPT ); Fri, 17 Oct 2014 09:15:53 -0400 Received: from bombadil.infradead.org ([198.137.202.9]:35840 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752738AbaJQNMt (ORCPT ); Fri, 17 Oct 2014 09:12:49 -0400 Date: Fri, 17 Oct 2014 06:12:47 -0700 From: Christoph Hellwig To: "Elliott, Robert (Server Storage)" Cc: Christoph Hellwig , Jens Axboe , "linux-kernel@vger.kernel.org" , "linux-scsi@vger.kernel.org" , Wu Fengguang Subject: Re: [PATCH] block: remove artifical max_hw_sectors cap Message-ID: <20141017131247.GA16538@infradead.org> References: <1410044885-14893-1-git-send-email-hch@lst.de> <20141001130822.GA5362@infradead.org> <94D0CD8314A33A4D9D801C0FE68B402958CC7BAB@G4W3202.americas.hpqcorp.net> <20141001211258.GB24820@infradead.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20141001211258.GB24820@infradead.org> User-Agent: Mutt/1.5.23 (2014-03-12) X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org See http://www.infradead.org/rpr.html Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Oct 01, 2014 at 02:12:58PM -0700, Christoph Hellwig wrote: > On Wed, Oct 01, 2014 at 06:59:34PM +0000, Elliott, Robert (Server Storage) wrote: > > One supporting example: A low limit interferes with creation of > > full stripe writes for RAID controllers. > > Yes, both Linux mdraid and parity raids are often crippled by the > default. The mdadm default of 512kb for each chunk combined with > the default limit very much guarantees a horrible out of the box > experience. Jens, can you apply this patch once the 3.19 queue opens?