Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756110AbYBFRHE (ORCPT ); Wed, 6 Feb 2008 12:07:04 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753541AbYBFRGx (ORCPT ); Wed, 6 Feb 2008 12:06:53 -0500 Received: from sj-iport-2.cisco.com ([171.71.176.71]:47116 "EHLO sj-iport-2.cisco.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753116AbYBFRGw (ORCPT ); Wed, 6 Feb 2008 12:06:52 -0500 To: "Bart Van Assche" Cc: "Erez Zilber" , "FUJITA Tomonori" , James.Bottomley@hansenpartnership.com, torvalds@linux-foundation.org, akpm@linux-foundation.org, vst@vlnb.net, linux-scsi@vger.kernel.org, scst-devel@lists.sourceforge.net, linux-kernel@vger.kernel.org Subject: Re: Integration of SCST in the mainstream Linux kernel X-Message-Flag: Warning: May contain useful information References: <1201639331.3069.58.camel@localhost.localdomain> <20080130083239E.fujita.tomonori@lab.ntt.co.jp> <47A89660.1080804@Voltaire.COM> From: Roland Dreier Date: Wed, 06 Feb 2008 09:06:37 -0800 In-Reply-To: (Bart Van Assche's message of "Wed, 6 Feb 2008 13:16:43 +0100") Message-ID: User-Agent: Gnus/5.1008 (Gnus v5.10.8) XEmacs/21.4.21 (linux) MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-OriginalArrivalTime: 06 Feb 2008 17:06:37.0645 (UTC) FILETIME=[A26477D0:01C868E2] Authentication-Results: sj-dkim-4; header.From=rdreier@cisco.com; dkim=pass ( sig from cisco.com/sjdkim4002 verified; ); Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 890 Lines: 19 > Sorry, but I'm afraid you got this wrong. When the iSER transport is > used instead of TCP, all data is sent via RDMA, including unsolicited > data. If you have look at the iSER implementation in the Linux kernel > (source files under drivers/infiniband/ulp/iser), you will see that > all data is transferred via RDMA and not via TCP/IP. I think the confusion here is caused by a slight misuse of the term "RDMA". It is true that all data is always transported over an InfiniBand connection when iSER is used, but not all such transfers are one-sided RDMA operations; some data can be transferred using send/receive operations. - R. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/