From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755679Ab1K2R7S (ORCPT ); Tue, 29 Nov 2011 12:59:18 -0500 Received: from acsinet15.oracle.com ([141.146.126.227]:35226 "EHLO acsinet15.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753234Ab1K2R7R (ORCPT ); Tue, 29 Nov 2011 12:59:17 -0500 To: Mike Snitzer Cc: linux-kernel@vger.kernel.org, Jens Axboe , "Martin K. Petersen" , Shuichi Ihara Subject: Re: [RFC PATCH] block: change max_segments default to USHRT_MAX From: "Martin K. Petersen" Organization: Oracle References: <1322517615-28530-1-git-send-email-snitzer@redhat.com> Date: Tue, 29 Nov 2011 12:59:01 -0500 In-Reply-To: <1322517615-28530-1-git-send-email-snitzer@redhat.com> (Mike Snitzer's message of "Mon, 28 Nov 2011 17:00:15 -0500") Message-ID: User-Agent: Gnus/5.110017 (No Gnus v0.17) Emacs/23.2 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain X-Source-IP: ucsinet21.oracle.com [156.151.31.93] X-CT-RefId: str=0001.0A090205.4ED51D71.008C,ss=1,re=0.000,fgs=0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org >>>>> "Mike" == Mike Snitzer writes: Mike> The reported problem was that a DM multipath device's max_segemnts Mike> was constrained to BLK_MAX_SEGMENTS (128) even though the Mike> underlying paths' max_segments were larger. For example, SCSI Mike> establishes a max_segments of SCSI_MAX_SG_CHAIN_SEGMENTS (2048). I'd rather that we revisited the patches I posted a while back where we have different defaults for LLDs and stacking drivers. I'll freshen those up and post them later today. I have a few concalls to clear first... -- Martin K. Petersen Oracle Linux Engineering