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=-2.5 required=3.0 tests=MAILING_LIST_MULTI,SPF_PASS, USER_AGENT_MUTT autolearn=ham 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 B5E77C43381 for ; Tue, 19 Feb 2019 12:26:13 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 7AF89217D7 for ; Tue, 19 Feb 2019 12:26:13 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 7AF89217D7 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 0E4E88E0003; Tue, 19 Feb 2019 07:26:13 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 06CA58E0002; Tue, 19 Feb 2019 07:26:13 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id E76D18E0003; Tue, 19 Feb 2019 07:26:12 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from mail-ed1-f70.google.com (mail-ed1-f70.google.com [209.85.208.70]) by kanga.kvack.org (Postfix) with ESMTP id 9CDF58E0002 for ; Tue, 19 Feb 2019 07:26:12 -0500 (EST) Received: by mail-ed1-f70.google.com with SMTP id u25so3301808edd.15 for ; Tue, 19 Feb 2019 04:26:12 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-original-authentication-results:x-gm-message-state:date:from:to :cc:subject:message-id:references:mime-version:content-disposition :in-reply-to:user-agent; bh=sUlM88ZKkaVzZg4CngY/sTO15uTwKdycPIdYqTs7XRc=; b=ssNL90K/LRKuKkRxz4JK9f/NbCfKV2AttEhK1pHUQvD2wSNdwxY2QLPEKt08xnJ1Vm myreLBEByd51lFKO+iqei89ofhO671KF4Uc7nmUFRunFfLYdLp3blNSUK/MfEMEish2o rXoCDT3ae7EVH/YpbWWErRTLBxY1TL4eSqwGiVxTaVIFZQmkc8ipGGEJfVexCZXMEyvU o6hbLM2Pa/KLzXCGex58pfA3/fZRCnmuShkY8YJHcucYZflrXFKxfQA5cd5mATa1fEd2 VeNASbTAoXy1UnqoByf16Um60Jv+3D4kuHaB4/s5sC5qTrOtKLcKTL6vw80Xl9bUqSjL tLfA== X-Original-Authentication-Results: mx.google.com; spf=softfail (google.com: domain of transitioning mhocko@kernel.org does not designate 195.135.220.15 as permitted sender) smtp.mailfrom=mhocko@kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=kernel.org X-Gm-Message-State: AHQUAuZrlBPasnUcJqUi64deEoU8QtO6MYtru3NStq4uk6RC1DRzyaLO 4qt6YFAfWW67pbZOzgnX126+bQlVrX+49uEusW4uVCPtdPRIq50IktYEjBVg69sKUZ3xkaOpHI6 2aFKGY5+tXOvnq0eJh8wUafLcxr1YQsZXZmYwX++ghuI3/YPRFgefYJo2fRVuI9I= X-Received: by 2002:a17:906:2643:: with SMTP id i3mr20249281ejc.157.1550579172115; Tue, 19 Feb 2019 04:26:12 -0800 (PST) X-Google-Smtp-Source: AHgI3IY/e7Bmb+dZthNLBOl4D+eo2pIyg7fjdArgvy6XQ9lQ7QyTpLThlnCBken/s+ljmywrN+ee X-Received: by 2002:a17:906:2643:: with SMTP id i3mr20249232ejc.157.1550579171204; Tue, 19 Feb 2019 04:26:11 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1550579171; cv=none; d=google.com; s=arc-20160816; b=KGl0yfANO/PkAhK59BDklVbxbHr+Bk0R+rp/hbso0zAmFLhPZ29U5AvLm71AnmjdQO EjaWJ5Mp9SliZRlFpMPvrT/5Xb8O4w3zK+kOUih4E8RtilK/Jo6Ouq45SKTPSDsMDNcc f7eFpRb9B+1jQihMnOJwkby5jmn2xsHi7Rd8OCwN3KKptuz/mia7rhnyK53MiKO73Gc/ LzrzE7Soy/iWqkXSt/ar8i24jxblM+eKQgwQqEArjcxRt3TVGgyYMHxG2oBqCSHCORw2 C2DeKdx/282bhSUdwWdohFJmQi7tx6g3XC5zGUy08Io3TH30PexQbI8qXqsSVC1BYYCs 7bZg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=user-agent:in-reply-to:content-disposition:mime-version:references :message-id:subject:cc:to:from:date; bh=sUlM88ZKkaVzZg4CngY/sTO15uTwKdycPIdYqTs7XRc=; b=y6zxlQ7YHrsHBTEknuVQyjYHQukVaduAWDXE9ikjoDqseNqDhBwKIz76+kxbdiia/s lf406zhAAvORhjmWs3YGoVoa3udqyrTzHgGQHXzL1eF+gT5jwI0O1yyz4RdDNh4bKPJ4 0ACrPe4xhy21xiq52CMxBEKl1Fx4GMw7HUpv0kA9FnE37HXqZgROuZOPpivQ3peCfRP7 KDB0ZLcKChOWzbskNdZUtg43GmyYLLAZv52hVwApXw3b/qAtq0/fmaqWf2WVN61GpDZL py1bt3bdtSOB35FkGBJGeJ4/+zq2lUg9Ej6YdmYlfCroNFYazZQIWcErnvIBFusiy9Sd NXvw== ARC-Authentication-Results: i=1; mx.google.com; spf=softfail (google.com: domain of transitioning mhocko@kernel.org does not designate 195.135.220.15 as permitted sender) smtp.mailfrom=mhocko@kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=kernel.org Received: from mx1.suse.de (mx2.suse.de. [195.135.220.15]) by mx.google.com with ESMTPS id c1si1565012edw.352.2019.02.19.04.26.10 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 19 Feb 2019 04:26:11 -0800 (PST) Received-SPF: softfail (google.com: domain of transitioning mhocko@kernel.org does not designate 195.135.220.15 as permitted sender) client-ip=195.135.220.15; Authentication-Results: mx.google.com; spf=softfail (google.com: domain of transitioning mhocko@kernel.org does not designate 195.135.220.15 as permitted sender) smtp.mailfrom=mhocko@kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=kernel.org X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.220.254]) by mx1.suse.de (Postfix) with ESMTP id 28457AE62; Tue, 19 Feb 2019 12:26:10 +0000 (UTC) Date: Tue, 19 Feb 2019 13:26:09 +0100 From: Michal Hocko To: Christopher Lameter Cc: lsf-pc@lists.linux-foundation.org, linux-mm@kvack.org Subject: Re: Memory management facing a 400Gpbs network link Message-ID: <20190219122609.GN4525@dhcp22.suse.cz> References: <01000168e2f54113-485312aa-7e08-4963-af92-803f8c7d21e6-000000@email.amazonses.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <01000168e2f54113-485312aa-7e08-4963-af92-803f8c7d21e6-000000@email.amazonses.com> User-Agent: Mutt/1.10.1 (2018-07-13) X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Tue 12-02-19 18:25:50, Cristopher Lameter wrote: > 400G Infiniband will become available this year. This means that the data > ingest speeds can be higher than the bandwidth of the processor > interacting with its own memory. > > For example a single hardware thread is limited to 20Gbyte/sec whereas the > network interface provides 50Gbytes/sec. These rates can only be obtained > currently with pinned memory. > > How can we evolve the memory management subsystem to operate at higher > speeds with more the comforts of paging and system calls that we are used > to? Realistically, is there anything we _can_ do when the HW is the bottleneck? -- Michal Hocko SUSE Labs