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=-4.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS 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 E76A5C55179 for ; Thu, 29 Oct 2020 00:56:23 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 92E9920724 for ; Thu, 29 Oct 2020 00:56:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1603932983; bh=BSxR9G99QZZs9WQft0msIQGjwPYUjz+YA1ZtZ90swg4=; h=Date:From:To:Cc:Subject:References:In-Reply-To:List-ID:From; b=syJHwJcY0/jaOJfePfIKj3QCX37+rbFEGHGYrrgbmlbxTSj4KbiFNcOc6IBDWM0GJ C8kf39yDx8gRxh0h8aCOWVZTRApqRSqw2SSYTBM1N4aVve/jVLbou3uZhkKdkoc/ND AoM1axLbysKE22dir4J6JAyk/3BcD2RLUPcXwV0A= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2391016AbgJ2A4W (ORCPT ); Wed, 28 Oct 2020 20:56:22 -0400 Received: from mail.kernel.org ([198.145.29.99]:60520 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731617AbgJ1WRg (ORCPT ); Wed, 28 Oct 2020 18:17:36 -0400 Received: from localhost (unknown [213.57.247.131]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 75ADC22275; Wed, 28 Oct 2020 07:16:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1603869365; bh=BSxR9G99QZZs9WQft0msIQGjwPYUjz+YA1ZtZ90swg4=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=ztI4+WMUvZa0GWBnfKsmFMQgiwsXUHvSmBC0cGW2zG4/jBiYdYKeimxRCZUGVtSzY NKX8OJOH0OC8jpwXKQEE570YqQVdwcjy+bJhU5rpVWZKm+OySoGTEKtYOuCbmWyfR9 X0M3K4XN+1qkqv+KA2ebktet80+pHQUHutl5NI5o= Date: Wed, 28 Oct 2020 09:16:01 +0200 From: Leon Romanovsky To: Chuck Lever Cc: Linux NFS Mailing List , linux-rdma@vger.kernel.org Subject: Re: [PATCH 00/20] NFSD support for multiple RPC/RDMA chunks Message-ID: <20201028071601.GA114054@unreal> References: <160373843299.1886.12604782813896379719.stgit@klimt.1015granger.net> <20201027060823.GF4821@unreal> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Precedence: bulk List-ID: X-Mailing-List: linux-rdma@vger.kernel.org On Tue, Oct 27, 2020 at 09:24:54AM -0400, Chuck Lever wrote: > Hi Leon- > > > On Oct 27, 2020, at 2:08 AM, Leon Romanovsky wrote: > > > > On Mon, Oct 26, 2020 at 02:53:53PM -0400, Chuck Lever wrote: > >> This series implements support for multiple RPC/RDMA chunks per RPC > >> transaction. This is one of the few remaining generalities that the > >> Linux NFS/RDMA server implementation lacks. > >> > >> There is currently one known NFS/RDMA client implementation that can > >> send multiple chunks per RPC, and that is Solaris. Multiple chunks > >> are rare enough that the Linux NFS/RDMA implementation has been > >> successful without this support for many years. > > > > So why do we need it? Solaris is dead, and like you wrote Linux systems > > work without this feature just fine, what are the benefits? Who will use it? > > The Linux NFS implementation is living. We can add the ability > to provision multiple chunks per RPC to the Linux NFS client at > any time. > > Likewise any actively developed NFS/RDMA implementation can add > this feature. The RPC/RDMA version 1 protocol does not have the > ability to communicate the maximum number of chunks the server > will accept per RPC. > > Other server implementations do support multiple chunks per RPC. > The Linux NFS/RDMA server implementation has always been incomplete > in this regard. > > And the Linux NFS server implementation (the non-transport specific > part) already supports multiple data payloads per NFSv4 COMPOUND. Thanks, I just got different feeling then I read the cover letter. You presented it like no one needs this feature. Thanks