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=-5.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,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 8C953C433DB for ; Tue, 23 Mar 2021 16:11:46 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5C737619BA for ; Tue, 23 Mar 2021 16:11:46 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232992AbhCWQLO (ORCPT ); Tue, 23 Mar 2021 12:11:14 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42700 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233128AbhCWQKm (ORCPT ); Tue, 23 Mar 2021 12:10:42 -0400 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7E0F3C061574 for ; Tue, 23 Mar 2021 09:10:42 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=In-Reply-To:Content-Type:MIME-Version: References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=cX03isNxkN4vUrWwAEsgU7MPkZp3w1M3zDMPZuSVs84=; b=nGOP2mVBhcb7juY8o+hSR+uhVc pP4+ZqT/eN5DvR07jjLjBqiED6LC3trefDGE5ureAq81MRrl7eG89RcBY452U9oM0D1nZc0CXyAFZ OwOACnJveWZLvVGG4sq1/i25wh2yOttRkn3UPlBFfI2fp+8ZRs5LFKrTTQXAeAlzerr+LIOBd54Jg ciduIGbpAdXha93RYKQbWHtYu366/CEuYShjPA25FJCMia1T0SJ+/PDlde4Q/w22QFt69O+CrvBXW cGPt4uHvzpsiO3HBjVfrjNZPMomsEYUUKR/E3btsePsmtRN5NpAZTxBVmRHaRU8XzRMUk15D6KCTM ejkxiZzw==; Received: from hch by casper.infradead.org with local (Exim 4.94 #2 (Red Hat Linux)) id 1lOjYj-00AFtf-BI; Tue, 23 Mar 2021 16:07:23 +0000 Date: Tue, 23 Mar 2021 16:07:09 +0000 From: Christoph Hellwig To: Jason Gunthorpe Cc: Christoph Hellwig , "Rimmer, Todd" , Dennis Dalessandro , "Wan, Kaike" , "dledford@redhat.com" , "linux-rdma@vger.kernel.org" Subject: Re: [PATCH RFC 0/9] A rendezvous module Message-ID: <20210323160709.GA2444111@infradead.org> References: <20210319194446.GA2356281@nvidia.com> <20210319202627.GC2356281@nvidia.com> <20210319205432.GE2356281@nvidia.com> <29607fd4-906d-7d0d-2940-62ff5c8c9ec6@cornelisnetworks.com> <20210323153041.GA2434215@infradead.org> <20210323154626.GH2356281@nvidia.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20210323154626.GH2356281@nvidia.com> X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: linux-rdma@vger.kernel.org On Tue, Mar 23, 2021 at 12:46:26PM -0300, Jason Gunthorpe wrote: > What Todd is alluding to here is the hacky DMABUF alternative that is > in the NVIDIA GPU driver - which HPC networking companies must support > if they want to interwork with the NVIDIA GPU. > > Every RDMA vendor playing in the HPC space has some out-of-tree driver > to enable this. :( I can only recommende everone to buy from a less fucked up GPU or accelerator vendor. We're certainly going to do everything we can to discourage making life easier for people who insist on doing this stupidest possible thing.