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=-2.3 required=3.0 tests=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 0DF26C3F2D1 for ; Thu, 5 Mar 2020 15:45:24 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id DD8472073B for ; Thu, 5 Mar 2020 15:45:23 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726981AbgCEPpW (ORCPT ); Thu, 5 Mar 2020 10:45:22 -0500 Received: from verein.lst.de ([213.95.11.211]:60036 "EHLO verein.lst.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725989AbgCEPpW (ORCPT ); Thu, 5 Mar 2020 10:45:22 -0500 Received: by verein.lst.de (Postfix, from userid 2407) id A52E468B05; Thu, 5 Mar 2020 16:45:20 +0100 (CET) Date: Thu, 5 Mar 2020 16:45:20 +0100 From: Christoph Hellwig To: David Rientjes Cc: Christoph Hellwig , Tom Lendacky , "Singh, Brijesh" , "Grimm, Jon" , Joerg Roedel , baekhw@google.com, "linux-kernel@vger.kernel.org" , "iommu@lists.linux-foundation.org" Subject: Re: [rfc 6/6] dma-remap: double the default DMA coherent pool size Message-ID: <20200305154520.GD5332@lst.de> References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.17 (2007-11-01) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sun, Mar 01, 2020 at 04:05:27PM -0800, David Rientjes wrote: > When AMD memory encryption is enabled, some devices may used more than > 256KB/sec from the atomic pools. Double the default size to make the > original size and expansion more appropriate. > > This provides a slight optimization on initial expansion and is deemed > appropriate for all configs with CONFIG_DMA_REMAP enabled because of the > increased reliance on the atomic pools. > > Alternatively, this could be done only when CONFIG_AMD_MEM_ENCRYPT is > enabled. Can we just scale the initial size based on the system memory size? 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=-2.3 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,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 682CDC3F2CD for ; Thu, 5 Mar 2020 15:45:28 +0000 (UTC) Received: from silver.osuosl.org (smtp3.osuosl.org [140.211.166.136]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 441352073B for ; Thu, 5 Mar 2020 15:45:27 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 441352073B Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=lst.de Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=iommu-bounces@lists.linux-foundation.org Received: from localhost (localhost [127.0.0.1]) by silver.osuosl.org (Postfix) with ESMTP id 496B82152A; Thu, 5 Mar 2020 15:45:27 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from silver.osuosl.org ([127.0.0.1]) by localhost (.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id dcksYoTh7umQ; Thu, 5 Mar 2020 15:45:26 +0000 (UTC) Received: from lists.linuxfoundation.org (lf-lists.osuosl.org [140.211.9.56]) by silver.osuosl.org (Postfix) with ESMTP id A6E1720372; Thu, 5 Mar 2020 15:45:26 +0000 (UTC) Received: from lf-lists.osuosl.org (localhost [127.0.0.1]) by lists.linuxfoundation.org (Postfix) with ESMTP id 8CB43C18DA; Thu, 5 Mar 2020 15:45:26 +0000 (UTC) Received: from silver.osuosl.org (smtp3.osuosl.org [140.211.166.136]) by lists.linuxfoundation.org (Postfix) with ESMTP id 29ECBC013E for ; Thu, 5 Mar 2020 15:45:24 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by silver.osuosl.org (Postfix) with ESMTP id 26DD921519 for ; Thu, 5 Mar 2020 15:45:24 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from silver.osuosl.org ([127.0.0.1]) by localhost (.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id nXTxIc6nNeTp for ; Thu, 5 Mar 2020 15:45:23 +0000 (UTC) X-Greylist: from auto-whitelisted by SQLgrey-1.7.6 Received: from verein.lst.de (verein.lst.de [213.95.11.211]) by silver.osuosl.org (Postfix) with ESMTPS id F2C8220372 for ; Thu, 5 Mar 2020 15:45:22 +0000 (UTC) Received: by verein.lst.de (Postfix, from userid 2407) id A52E468B05; Thu, 5 Mar 2020 16:45:20 +0100 (CET) Date: Thu, 5 Mar 2020 16:45:20 +0100 From: Christoph Hellwig To: David Rientjes Subject: Re: [rfc 6/6] dma-remap: double the default DMA coherent pool size Message-ID: <20200305154520.GD5332@lst.de> References: MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.17 (2007-11-01) Cc: Tom Lendacky , "Singh, Brijesh" , "Grimm, Jon" , baekhw@google.com, "linux-kernel@vger.kernel.org" , "iommu@lists.linux-foundation.org" , Christoph Hellwig X-BeenThere: iommu@lists.linux-foundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Development issues for Linux IOMMU support List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: iommu-bounces@lists.linux-foundation.org Sender: "iommu" On Sun, Mar 01, 2020 at 04:05:27PM -0800, David Rientjes wrote: > When AMD memory encryption is enabled, some devices may used more than > 256KB/sec from the atomic pools. Double the default size to make the > original size and expansion more appropriate. > > This provides a slight optimization on initial expansion and is deemed > appropriate for all configs with CONFIG_DMA_REMAP enabled because of the > increased reliance on the atomic pools. > > Alternatively, this could be done only when CONFIG_AMD_MEM_ENCRYPT is > enabled. Can we just scale the initial size based on the system memory size? _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu