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=-10.5 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, NICE_REPLY_A,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 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 AF2FEC63797 for ; Thu, 22 Jul 2021 17:40:29 +0000 (UTC) Received: from smtp4.osuosl.org (smtp4.osuosl.org [140.211.166.137]) (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 57C9061248 for ; Thu, 22 Jul 2021 17:40:29 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 57C9061248 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=arm.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=iommu-bounces@lists.linux-foundation.org Received: from localhost (localhost [127.0.0.1]) by smtp4.osuosl.org (Postfix) with ESMTP id 1E8A8405C4; Thu, 22 Jul 2021 17:40:29 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from smtp4.osuosl.org ([127.0.0.1]) by localhost (smtp4.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id GtuZIMF2crbv; Thu, 22 Jul 2021 17:40:28 +0000 (UTC) Received: from lists.linuxfoundation.org (lf-lists.osuosl.org [IPv6:2605:bc80:3010:104::8cd3:938]) by smtp4.osuosl.org (Postfix) with ESMTPS id AB5E74039E; Thu, 22 Jul 2021 17:40:27 +0000 (UTC) Received: from lf-lists.osuosl.org (localhost [127.0.0.1]) by lists.linuxfoundation.org (Postfix) with ESMTP id 82475C0010; Thu, 22 Jul 2021 17:40:27 +0000 (UTC) Received: from smtp2.osuosl.org (smtp2.osuosl.org [140.211.166.133]) by lists.linuxfoundation.org (Postfix) with ESMTP id 13678C000E for ; Thu, 22 Jul 2021 17:40:26 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by smtp2.osuosl.org (Postfix) with ESMTP id EF2254011F for ; Thu, 22 Jul 2021 17:40:25 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from smtp2.osuosl.org ([127.0.0.1]) by localhost (smtp2.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id L-u8RWGUbf1e for ; Thu, 22 Jul 2021 17:40:25 +0000 (UTC) X-Greylist: domain auto-whitelisted by SQLgrey-1.8.0 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp2.osuosl.org (Postfix) with ESMTP id F366E400BD for ; Thu, 22 Jul 2021 17:40:24 +0000 (UTC) Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 42693106F; Thu, 22 Jul 2021 10:40:24 -0700 (PDT) Received: from [10.57.36.146] (unknown [10.57.36.146]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 120373F694; Thu, 22 Jul 2021 10:40:22 -0700 (PDT) Subject: Re: [bug report] iommu_dma_unmap_sg() is very slow then running IO from remote numa node To: Ming Lei , John Garry References: <74537f9c-af5f-cd84-60ab-49ca6220310e@huawei.com> <9c929985-4fcb-e65d-0265-34c820b770ea@huawei.com> From: Robin Murphy Message-ID: <0adbe03b-ce26-e4d3-3425-d967bc436ef5@arm.com> Date: Thu, 22 Jul 2021 18:40:18 +0100 User-Agent: Mozilla/5.0 (Windows NT 10.0; rv:78.0) Gecko/20100101 Thunderbird/78.12.0 MIME-Version: 1.0 In-Reply-To: Content-Language: en-GB Cc: linux-arm-kernel@lists.infradead.org, iommu@lists.linux-foundation.org, Will Deacon , linux-kernel@vger.kernel.org, linux-nvme@lists.infradead.org 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-Transfer-Encoding: base64 Content-Type: text/plain; charset="utf-8"; Format="flowed" Errors-To: iommu-bounces@lists.linux-foundation.org Sender: "iommu" T24gMjAyMS0wNy0yMiAxNjo1NCwgTWluZyBMZWkgd3JvdGU6ClsuLi5dCj4+IElmIHlvdSBhcmUg c3RpbGwga2VlbiB0byBpbnZlc3RpZ2F0ZSBtb3JlLCB0aGVuIGNhbiB0cnkgZWl0aGVyIG9mIHRo ZXNlOgo+Pgo+PiAtIGFkZCBpb21tdS5zdHJpY3Q9MCB0byB0aGUgY21kbGluZQo+Pgo+PiAtIHVz ZSBwZXJmIHJlY29yZCthbm5vdGF0ZSB0byBmaW5kIHRoZSBob3RzcG90Cj4+ICAgIC0gRm9yIHRo aXMgeW91IG5lZWQgdG8gZW5hYmxlIHBzdWVkby1OTUkgd2l0aCAyeCBzdGVwczoKPj4gICAgICBD T05GSUdfQVJNNjRfUFNFVURPX05NST15IGluIGRlZmNvbmZpZwo+PiAgICAgIEFkZCBpcnFjaGlw LmdpY3YzX3BzZXVkb19ubWk9MQo+Pgo+PiAgICAgIFNlZSBodHRwczovL2dpdC5rZXJuZWwub3Jn L3B1Yi9zY20vbGludXgva2VybmVsL2dpdC90b3J2YWxkcy9saW51eC5naXQvdHJlZS9hcmNoL2Fy bTY0L0tjb25maWcjbjE3NDUKPj4gICAgICBZb3VyIGtlcm5lbCBsb2cgc2hvdWxkIHNob3c6Cj4+ ICAgICAgWyAgICAwLjAwMDAwMF0gR0lDdjM6IFBzZXVkby1OTUlzIGVuYWJsZWQgdXNpbmcgZm9y Y2VkIElDQ19QTVJfRUwxCj4+IHN5bmNocm9uaXNhdGlvbgo+IAo+IE9LLCB3aWxsIHRyeSB0aGUg YWJvdmUgdG9tb3Jyb3cuCgpUaGFua3MsIEkgd2FzIGFsc28gZ29pbmcgdG8gc3VnZ2VzdCB0aGUg bGF0dGVyLCBzaW5jZSBpdCdzIHdoYXQgCmFybV9zbW11X2NtZHFfaXNzdWVfY21kbGlzdCgpIGRv ZXMgd2l0aCBJUlFzIG1hc2tlZCB0aGF0IHNob3VsZCBiZSBtb3N0IAppbmRpY2F0aXZlIG9mIHdo ZXJlIHRoZSBzbG93bmVzcyBtb3N0IGxpa2VseSBzdGVtcyBmcm9tLgoKRldJVyBJIHdvdWxkIGV4 cGVjdCBpb21tdS5zdHJpY3Q9MCB0byBnaXZlIGEgcHJvcG9ydGlvbmFsIHJlZHVjdGlvbiBpbiAK U01NVSBvdmVyaGVhZCBmb3IgYm90aCBjYXNlcyBzaW5jZSBpdCBzaG91bGQgZWZmZWN0aXZlbHkg bWVhbiBvbmx5IDEvMjU2IAphcyBtYW55IGludmFsaWRhdGlvbnMgYXJlIGlzc3VlZC4KCkNvdWxk IHlvdSBhbHNvIGNoZWNrIHdoZXRoZXIgdGhlIFNNTVUgcGxhdGZvcm0gZGV2aWNlcyBoYXZlICJu dW1hX25vZGUiIApwcm9wZXJ0aWVzIGV4cG9zZWQgaW4gc3lzZnMgKGFuZCBpZiBzbyB3aGV0aGVy IHRoZSB2YWx1ZXMgbG9vayByaWdodCksIAphbmQgc2hhcmUgYWxsIHRoZSBTTU1VIG91dHB1dCBm cm9tIHRoZSBib290IGxvZz8KCkkgc3RpbGwgc3VzcGVjdCB0aGF0IHRoZSBtb3N0IHNpZ25pZmlj YW50IGJvdHRsZW5lY2sgaXMgbGlrZWx5IHRvIGJlIApNTUlPIGFjY2VzcyBhY3Jvc3MgY2hpcHMs IGluY3VycmluZyB0aGUgQ01ML0NDSVggbGF0ZW5jeSB0d2ljZSBmb3IgZXZlcnkgCnNpbmdsZSBy ZWFkLCBidXQgaXQncyBhbHNvIHBvc3NpYmxlIHRoYXQgdGhlIHBlcmZvcm1hbmNlIG9mIHRoZSBT TU1VIAppdHNlbGYgY291bGQgYmUgcmVkdWNlZCBpZiBpdHMgTlVNQSBhZmZpbml0eSBpcyBub3Qg ZGVzY3JpYmVkIGFuZCB3ZSBlbmQgCnVwIGFsbG9jYXRpbmcgc3R1ZmYgbGlrZSBwYWdldGFibGVz IG9uIHRoZSB3cm9uZyBub2RlIGFzIHdlbGwuCgo+PiBCdXQgbXkgaW1wcmVzc2lvbiBpcyB0aGF0 IHRoaXMgbWF5IGJlIGEgSFcgaW1wbGVtZW50YXRpb24gaXNzdWUsIGNvbnNpZGVyaW5nCj4+IHdl IGRvbid0IHNlZSBzdWNoIGEgaHVnZSBkcm9wIG9mZiBvbiBvdXIgSFcuCj4gCj4gRXhjZXB0IGZv ciBtcGVyZS1tdGphZGUsIHdlIHNhdyBiYWQgbnZtZSBwZXJmb3JtYW5jZSBvbiBUaHVuZGVyWDLC riBDTjk5WFggdG9vLAo+IGJ1dCBJIGRvbid0IGdldCBvbmUgQ045OVhYIHN5c3RlbSB0byBjaGVj ayBpZiB0aGUgaXNzdWUgaXMgc2FtZSB3aXRoCj4gdGhpcyBvbmUuCgpJIGtub3cgQ2F2aXVtJ3Mg U01NVSBpbXBsZW1lbnRhdGlvbiBkaWRuJ3Qgc3VwcG9ydCBNU0lzLCBzbyB0aGF0IGNhc2UgCndv dWxkIHF1aXRlIHBvc3NpYmx5IGxlYW4gdG93YXJkcyB0aGUgTU1JTyBwb2xsaW5nIGFuZ2xlIGFz IHdlbGwgKGFsYmVpdCAKd2l0aCBhIHZlcnkgZGlmZmVyZW50IGludGVyY29ubmVjdCkuCgpSb2Jp bi4KX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX18KaW9tbXUg bWFpbGluZyBsaXN0CmlvbW11QGxpc3RzLmxpbnV4LWZvdW5kYXRpb24ub3JnCmh0dHBzOi8vbGlz dHMubGludXhmb3VuZGF0aW9uLm9yZy9tYWlsbWFuL2xpc3RpbmZvL2lvbW11