Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1763398AbYBFMRE (ORCPT ); Wed, 6 Feb 2008 07:17:04 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1762225AbYBFMQu (ORCPT ); Wed, 6 Feb 2008 07:16:50 -0500 Received: from el-out-1112.google.com ([209.85.162.176]:46694 "EHLO el-out-1112.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1762257AbYBFMQt (ORCPT ); Wed, 6 Feb 2008 07:16:49 -0500 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:from:to:subject:cc:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references; b=x8nd+ry1b9ncOcTBt7phLnPCDlmPPzCg2ZNvc1LWvzRBJTuVrLLIrYCisvXbHltAvh9J7UFAlHWX7qUw3QUKDVsTqzNQidet3bT2quqf9irgHmDouazGLAX156m9wbuqdRAcAo7lhNhhvna5YaGn3g6iV11hyHWn9Iop75B72po= Message-ID: Date: Wed, 6 Feb 2008 13:16:43 +0100 From: "Bart Van Assche" To: "Erez Zilber" Subject: Re: Integration of SCST in the mainstream Linux kernel Cc: "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 In-Reply-To: <47A89660.1080804@Voltaire.COM> MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Content-Disposition: inline References: <1201639331.3069.58.camel@localhost.localdomain> <20080130083239E.fujita.tomonori@lab.ntt.co.jp> <47A89660.1080804@Voltaire.COM> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 936 Lines: 19 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. 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/