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=-5.4 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,NICE_REPLY_A,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 D8C76C6377D for ; Wed, 21 Jul 2021 09:31:50 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C6CBC60E08 for ; Wed, 21 Jul 2021 09:31:50 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237459AbhGUIuf (ORCPT ); Wed, 21 Jul 2021 04:50:35 -0400 Received: from frasgout.his.huawei.com ([185.176.79.56]:3441 "EHLO frasgout.his.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236812AbhGUIng (ORCPT ); Wed, 21 Jul 2021 04:43:36 -0400 Received: from fraeml740-chm.china.huawei.com (unknown [172.18.147.200]) by frasgout.his.huawei.com (SkyGuard) with ESMTP id 4GV8s41q2Hz6D8mK; Wed, 21 Jul 2021 17:08:56 +0800 (CST) Received: from lhreml724-chm.china.huawei.com (10.201.108.75) by fraeml740-chm.china.huawei.com (10.206.15.221) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2176.2; Wed, 21 Jul 2021 11:23:41 +0200 Received: from [10.47.85.43] (10.47.85.43) 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; Wed, 21 Jul 2021 10:23:41 +0100 Subject: Re: [bug report] iommu_dma_unmap_sg() is very slow then running IO from remote numa node To: Ming Lei CC: Robin Murphy , , Will Deacon , , , References: <23e7956b-f3b5-b585-3c18-724165994051@arm.com> From: John Garry Message-ID: <74537f9c-af5f-cd84-60ab-49ca6220310e@huawei.com> Date: Wed, 21 Jul 2021 10:23:38 +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-Type: text/plain; charset="utf-8"; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-Originating-IP: [10.47.85.43] X-ClientProxiedBy: lhreml734-chm.china.huawei.com (10.201.108.85) To lhreml724-chm.china.huawei.com (10.201.108.75) X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 21/07/2021 02:40, Ming Lei wrote: >> I think that you should see a significant performance boost. > There is build issue, please check your tree: > > MODPOST vmlinux.symvers > MODINFO modules.builtin.modinfo > GEN modules.builtin > LD .tmp_vmlinux.btf > ld: Unexpected GOT/PLT entries detected! > ld: Unexpected run-time procedure linkages detected! > ld: drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.o: in function `smmu_test_store': > /root/git/linux/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c:3892: undefined reference to `smmu_test_core' > BTF .btf.vmlinux.bin.o > pahole: .tmp_vmlinux.btf: No such file or directory > LD .tmp_vmlinux.kallsyms1 > .btf.vmlinux.bin.o: file not recognized: file format not recognized > make: *** [Makefile:1177: vmlinux] Error 1 Ah, sorry. I had some test code which was not properly guarded with necessary build switches. I have now removed that from the tree, so please re-pull. Thanks, John