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=-2.0 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, 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 C700CC3A5A7 for ; Wed, 4 Sep 2019 12:54:31 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 8EB412073F for ; Wed, 4 Sep 2019 12:54:31 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=shipmail.org header.i=@shipmail.org header.b="nsrFer4N" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729950AbfIDMya (ORCPT ); Wed, 4 Sep 2019 08:54:30 -0400 Received: from ste-pvt-msa1.bahnhof.se ([213.80.101.70]:22688 "EHLO ste-pvt-msa1.bahnhof.se" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725965AbfIDMya (ORCPT ); Wed, 4 Sep 2019 08:54:30 -0400 Received: from localhost (localhost [127.0.0.1]) by ste-pvt-msa1.bahnhof.se (Postfix) with ESMTP id 953AD3F6BF; Wed, 4 Sep 2019 14:54:28 +0200 (CEST) Authentication-Results: ste-pvt-msa1.bahnhof.se; dkim=pass (1024-bit key; unprotected) header.d=shipmail.org header.i=@shipmail.org header.b=nsrFer4N; dkim-atps=neutral X-Virus-Scanned: Debian amavisd-new at bahnhof.se Received: from ste-pvt-msa1.bahnhof.se ([127.0.0.1]) by localhost (ste-pvt-msa1.bahnhof.se [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id BVSgqDGQCpuw; Wed, 4 Sep 2019 14:54:27 +0200 (CEST) Received: from mail1.shipmail.org (h-205-35.A357.priv.bahnhof.se [155.4.205.35]) (Authenticated sender: mb878879) by ste-pvt-msa1.bahnhof.se (Postfix) with ESMTPA id 69C7A3F6A7; Wed, 4 Sep 2019 14:54:26 +0200 (CEST) Received: from localhost.localdomain (h-205-35.A357.priv.bahnhof.se [155.4.205.35]) by mail1.shipmail.org (Postfix) with ESMTPSA id A7CB7360160; Wed, 4 Sep 2019 14:54:26 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=shipmail.org; s=mail; t=1567601666; bh=upzIZSLLF6duTN76hVSfhKtMddKOA3X3vki43QO64y0=; h=Subject:To:Cc:References:From:Date:In-Reply-To:From; b=nsrFer4N1Lg3tAVhzg80ql6321PSBah+sDckVQAilsxXlTvvs1CZgE9WsJT3iClYB +Zhag++W127Yry/WQq+rAcBWBTBmUsH4mlEKJOFidWAFnHi5tTyxT4Vd7V3v3oKkGs WoBs1AKqcozTOQ60/PYSQHqg+1qKp67H9Nhek/x8= Subject: Re: dma api errors with swiotlb To: Christoph Hellwig Cc: "linux-kernel@vger.kernel.org" References: <20190904121722.GA15601@infradead.org> From: =?UTF-8?Q?Thomas_Hellstr=c3=b6m_=28VMware=29?= Organization: VMware Inc. Message-ID: <4e21951d-025a-2b3d-14c8-878c6f237525@shipmail.org> Date: Wed, 4 Sep 2019 14:54:26 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.6.1 MIME-Version: 1.0 In-Reply-To: <20190904121722.GA15601@infradead.org> Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Content-Language: en-US Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 9/4/19 2:17 PM, Christoph Hellwig wrote: > A call to dma_max_mapping_size() to limit the maximum I/O size solves > that problem. With the latest kernel that should actually be done > automatically by the SCSI midlayer for you. Hmm, OK. I guess with a sufficient queue depth and many mappings waiting for DMA completion, the SWIOTLB may fill up anyway... I'll see if I can come up with something. Thanks, Thomas