From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.4 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 6A9EEC2D0C2 for ; Thu, 2 Jan 2020 18:29:40 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 3CE1721655 for ; Thu, 2 Jan 2020 18:29:40 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=ziepe.ca header.i=@ziepe.ca header.b="OvFYN9N7" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727952AbgABS3j (ORCPT ); Thu, 2 Jan 2020 13:29:39 -0500 Received: from mail-qk1-f180.google.com ([209.85.222.180]:47028 "EHLO mail-qk1-f180.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727829AbgABS3j (ORCPT ); Thu, 2 Jan 2020 13:29:39 -0500 Received: by mail-qk1-f180.google.com with SMTP id r14so31973237qke.13 for ; Thu, 02 Jan 2020 10:29:39 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ziepe.ca; s=google; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to:user-agent; bh=9S/RnlYUTiW5scmZn1rpA3s27gWfLJPlKX02uUmU8iE=; b=OvFYN9N7+5SyTDmLFjXB54DHeTZwPBYhVdmsktc8tQiKiVzVXXEqQkAACMAyrXF7Y0 Z4v9KcwNgghd4W50g/qPPpmIOoBrRy05r7f5AK0vI8bf0Uya2R63SQYxA7M/fIJqbNAL UItxMrxvUr+at1Dx+RBjigxkTIFb+kv+eQQSuOt54m0SBjZr53eeHm6fUp7B92jYPrku S38ovCbk+OWtI/8c6fXJfxOGEBPnmQboNHvKBbrIlEDVrO5UVqBb1A4yUid6F/4dRH0c qQAOC46KAznOwyTD9Bu8sYTZESj3yyWMR7J2PcqUxtICxurecmoKwkLdxhhqCSKuFt3d jxUg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to:user-agent; bh=9S/RnlYUTiW5scmZn1rpA3s27gWfLJPlKX02uUmU8iE=; b=S6W8txEbOyZJxKQqR/hC6oRMEuJHgEDwmEU6mS4Nc1qOW1PkyhKVrS6ggGLRIcSSZ5 N+LQGbvWlrvw9VuT+zy3REBUbEO5+mILuyv+wHXF60xcu1lLwlDF1iQrONWvz31woNWN 0vS7l8LOvCxmHdAcxhuc4dFAG6CoiF1ejUudQoRtxqZXFPTMeNrf9lPTZCtEAZpyYCeB b90Cm1woc7mrZeBxm8/NKeRpKb7WD4zSJ8R+ibzVugzQ3zXG2TFLqCe7fo93xUigDhMW XG9x1nIzQffosw6Wtrn2P8Uq9HPpe2unKqNJYHBWr2aaVY4OkFHiLcs8s8OYEd9Xdelz p7tw== X-Gm-Message-State: APjAAAW3SJgAKELkOXDsTIdyBihL1XUowyiUIC4az/nGeJZphU6RD3J4 vJlIe8QBjaBhcghYrD34kiiSJCrIdls= X-Google-Smtp-Source: APXvYqwsWQ9aSEtfGbklx39DxS5hPl+qXOI85g0RMVrJL4ghc6jlxvLOCyfoi/pG3yWmugQETEdEIw== X-Received: by 2002:ae9:f709:: with SMTP id s9mr67131364qkg.463.1577989778700; Thu, 02 Jan 2020 10:29:38 -0800 (PST) Received: from ziepe.ca (hlfxns017vw-142-68-57-212.dhcp-dynamic.fibreop.ns.bellaliant.net. [142.68.57.212]) by smtp.gmail.com with ESMTPSA id s33sm17364471qtb.52.2020.01.02.10.29.38 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Thu, 02 Jan 2020 10:29:38 -0800 (PST) Received: from jgg by mlx.ziepe.ca with local (Exim 4.90_1) (envelope-from ) id 1in5E1-0003fD-Oc; Thu, 02 Jan 2020 14:29:37 -0400 Date: Thu, 2 Jan 2020 14:29:37 -0400 From: Jason Gunthorpe To: Terry Toole Cc: linux-rdma@vger.kernel.org Subject: Re: Is it possible to transfer a large file between two computers using RDMA UD? Message-ID: <20200102182937.GG9282@ziepe.ca> References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.9.4 (2018-02-28) Sender: linux-rdma-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-rdma@vger.kernel.org On Thu, Jan 02, 2020 at 09:47:06AM -0500, Terry Toole wrote: > Hi, > Is it possible to transfer a large file, say 25GB, between two computers using > RDMA UD, and have an exact copy of the original file on the receiving side? My > understanding is that the order of the messages is not guaranteed with UD. > But I thought that if I only use one QP I could ensure that the ordering of the > data will be predictable. It is not guaranteed to be in order. Why would you do this anyhow? The overhead to use RC is pretty small Jason