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dmarc=fail (p=none dis=none) header.from=arm.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@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=ycjPCl9mUoeed/SNqE4p+D/u+diEnLEbO4pxhUfbNKw=; b=KYJNOrnyiIBr9lQCDBbSBmfOd1 eO8Vo49+ebhjIyaV24/bqOqyfBT5ycnHuXlhWAfI60r7NKO4CSY1h/D8wQLWnrMroktFFMG6mkueQ Yq5uHtpfpJ9R85VH17GO+w+0kY46bU4dTPhZwoid8AlLQVwL2Li7r4AwGMezI5gUjGFFy18cgzHG1 CjNVAuIcU3G2nweuizmADASCZWhwmZUY0grz54goBhgIME4te7JOsRqL7JSiw2mPp2QjVv0+ymP1r 1WVssRmXcsRk+MKIZowY7x4UjUERrGosWQp1WcPEf4wX4PuqQKBqL9VvLI4sSCXmIuC5vlDlahF1r DbETvhxA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1m6cgR-002KXe-JZ; Thu, 22 Jul 2021 17:40:31 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1m6cgN-002KWt-1t; Thu, 22 Jul 2021 17:40:28 +0000 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 Cc: linux-kernel@vger.kernel.org, linux-nvme@lists.infradead.org, iommu@lists.linux-foundation.org, Will Deacon , linux-arm-kernel@lists.infradead.org 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 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210722_104027_188007_DD8C874C X-CRM114-Status: GOOD ( 17.17 ) 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: base64 Content-Type: text/plain; charset="utf-8"; Format="flowed" Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org 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 bi4KCl9fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fCmxpbnV4 LWFybS1rZXJuZWwgbWFpbGluZyBsaXN0CmxpbnV4LWFybS1rZXJuZWxAbGlzdHMuaW5mcmFkZWFk Lm9yZwpodHRwOi8vbGlzdHMuaW5mcmFkZWFkLm9yZy9tYWlsbWFuL2xpc3RpbmZvL2xpbnV4LWFy bS1rZXJuZWwK