Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755944AbYBFQtI (ORCPT ); Wed, 6 Feb 2008 11:49:08 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752257AbYBFQsy (ORCPT ); Wed, 6 Feb 2008 11:48:54 -0500 Received: from bzq-219-195-70.pop.bezeqint.net ([62.219.195.70]:38031 "EHLO bh-buildlin1.bhalevy.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751766AbYBFQsx (ORCPT ); Wed, 6 Feb 2008 11:48:53 -0500 Message-ID: <47A9E43B.3030407@panasas.com> Date: Wed, 06 Feb 2008 18:45:47 +0200 From: Benny Halevy Organization: Panasas, Inc. User-Agent: Thunderbird 2.0.0.9 (X11/20071031) MIME-Version: 1.0 To: Bart Van Assche CC: Erez Zilber , FUJITA Tomonori , rdreier@cisco.com, 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 References: <1201639331.3069.58.camel@localhost.localdomain> <20080130083239E.fujita.tomonori@lab.ntt.co.jp> <47A89660.1080804@Voltaire.COM> In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1196 Lines: 27 On Feb. 06, 2008, 14:16 +0200, "Bart Van Assche" wrote: > On Feb 5, 2008 6:01 PM, Erez Zilber wrote: >> Using such large values for FirstBurstLength will give you poor >> performance numbers for WRITE commands (with iSER). FirstBurstLength >> means how much data should you send as unsolicited data (i.e. without >> RDMA). It means that your WRITE commands were sent without RDMA. > > 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. Regardless of what the current implementation is, the behavior you (Bart) describe seems to disagree with http://www.ietf.org/rfc/rfc5046.txt. Benny > > Bart Van Assche. > - -- 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/