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=-6.4 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, NICE_REPLY_A,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 C8BF7C4338F for ; Mon, 26 Jul 2021 08:03:30 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (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 96B7660F6D for ; Mon, 26 Jul 2021 08:03:30 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 96B7660F6D Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=huawei.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:Content-Type: Content-Transfer-Encoding:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:Date:Message-ID:From: References:CC:To:Subject:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=/U2x1QgM8/LwOWPc02NLdrQHNuXVgzGlvwGOzWEmxD8=; b=mZr7vTJdwExaZmTgQhx67hH4IM tA1nn6qkf8aAFGPAx2DQrzPdoUn5e/+46eOURD6GF5G5oIrtuocbUhG83XlBQsZwJe6TqgbxOhjcZ MZTHrbvckht087Hu1ELVrorPxi3kkq/rRn5M9KaPTdd0ldEhOzDXVpevEVcLpS//Vf2Q2zfkDi5DA QM//LNDG82rstc2qFD8VolbPRkDILcyFvKbeLCxJkM/KvQUYwSvK7l399yWVsrtiPWWQfAT/105qj hmVSLx4IQJ0/VYHh/ZBtqMXZtgSh6MiioAWhgE/Q3OJJD8hq/7zhhaj9DnZ9Eh0a5eNoMAD4lEGJA DC8ON0SQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1m7vP8-00A1rp-00; Mon, 26 Jul 2021 07:52:02 +0000 Received: from frasgout.his.huawei.com ([185.176.79.56]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1m7vP3-00A1pU-Vy; Mon, 26 Jul 2021 07:51:59 +0000 Received: from fraeml704-chm.china.huawei.com (unknown [172.18.147.207]) by frasgout.his.huawei.com (SkyGuard) with ESMTP id 4GYBZW2VHFz6BBDR; Mon, 26 Jul 2021 15:36:51 +0800 (CST) Received: from lhreml724-chm.china.huawei.com (10.201.108.75) by fraeml704-chm.china.huawei.com (10.206.15.53) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.2176.2; Mon, 26 Jul 2021 09:51:50 +0200 Received: from [10.47.94.42] (10.47.94.42) by lhreml724-chm.china.huawei.com (10.201.108.75) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2176.2; Mon, 26 Jul 2021 08:51:50 +0100 Subject: Re: [bug report] iommu_dma_unmap_sg() is very slow then running IO from remote numa node To: Ming Lei , Robin Murphy CC: , , , Will Deacon , References: <74537f9c-af5f-cd84-60ab-49ca6220310e@huawei.com> <9c929985-4fcb-e65d-0265-34c820b770ea@huawei.com> <0adbe03b-ce26-e4d3-3425-d967bc436ef5@arm.com> From: John Garry Message-ID: <6ceab844-465f-3bf3-1809-5df1f1dbbc5c@huawei.com> Date: Mon, 26 Jul 2021 08:51:32 +0100 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:68.0) Gecko/20100101 Thunderbird/68.12.1 MIME-Version: 1.0 In-Reply-To: Content-Language: en-US X-Originating-IP: [10.47.94.42] X-ClientProxiedBy: lhreml748-chm.china.huawei.com (10.201.108.198) To lhreml724-chm.china.huawei.com (10.201.108.75) X-CFilter-Loop: Reflected X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210726_005158_226742_B811873C X-CRM114-Status: UNSURE ( 7.74 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 23/07/2021 11:21, Ming Lei wrote: >> Thanks, I was also going to suggest the latter, since it's what >> arm_smmu_cmdq_issue_cmdlist() does with IRQs masked that should be most >> indicative of where the slowness most likely stems from. > The improvement from 'iommu.strict=0' is very small: > Have you tried turning off the IOMMU to ensure that this is really just an IOMMU problem? You can try setting CONFIG_ARM_SMMU_V3=n in the defconfig or passing cmdline param iommu.passthrough=1 to bypass the the SMMU (equivalent to disabling for kernel drivers). Thanks, John _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel