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Thu, 22 Jul 2021 13:56:31 +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 1m6ZAC-001mGr-Hv; Thu, 22 Jul 2021 13:55:05 +0000 Received: from fraeml701-chm.china.huawei.com (unknown [172.18.147.207]) by frasgout.his.huawei.com (SkyGuard) with ESMTP id 4GVtyD4mF5z6DHHy; Thu, 22 Jul 2021 21:45:56 +0800 (CST) Received: from lhreml724-chm.china.huawei.com (10.201.108.75) by fraeml701-chm.china.huawei.com (10.206.15.50) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.2176.2; Thu, 22 Jul 2021 15:54:51 +0200 Received: from [10.47.26.161] (10.47.26.161) by lhreml724-chm.china.huawei.com (10.201.108.75) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256) id 15.1.2176.2; Thu, 22 Jul 2021 14:54:51 +0100 Subject: Re: [bug report] iommu_dma_unmap_sg() is very slow then running IO from remote numa node To: Marc Zyngier CC: Ming Lei , Robin Murphy , , Will Deacon , , , References: <23e7956b-f3b5-b585-3c18-724165994051@arm.com> <74537f9c-af5f-cd84-60ab-49ca6220310e@huawei.com> <9c929985-4fcb-e65d-0265-34c820b770ea@huawei.com> <411dfc7cd330df1f681137d77e846b78@misterjones.org> From: John Garry Message-ID: Date: Thu, 22 Jul 2021 14:54:44 +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: <411dfc7cd330df1f681137d77e846b78@misterjones.org> Content-Language: en-US X-Originating-IP: [10.47.26.161] X-ClientProxiedBy: lhreml706-chm.china.huawei.com (10.201.108.55) 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-20210722_065500_787592_AAAAF19C X-CRM114-Status: GOOD ( 10.99 ) X-BeenThere: linux-nvme@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-nvme" Errors-To: linux-nvme-bounces+linux-nvme=archiver.kernel.org@lists.infradead.org T24gMjIvMDcvMjAyMSAxMzo1MywgTWFyYyBaeW5naWVyIHdyb3RlOgo+IEhpIEpvaG4sCj4gCj4g Wy4uLl0KPiAKPj4gwqDCoMKgIFlvdXIga2VybmVsIGxvZyBzaG91bGQgc2hvdzoKPj4gwqDCoMKg IFvCoMKgwqAgMC4wMDAwMDBdIEdJQ3YzOiBQc2V1ZG8tTk1JcyBlbmFibGVkIHVzaW5nIGZvcmNl ZCBJQ0NfUE1SX0VMMQo+PiBzeW5jaHJvbmlzYXRpb24KPiAKPiBVbnJlbGF0ZWQsIGJ1dCB5b3Ug c2VlbSB0byBiZSBydW5uaW5nIHdpdGggSUNDX0NUTFJfRUwzLlBNSEUgc2V0LAo+IHdoaWNoIG1h a2VzIHRoZSBvdmVyaGVhZCBvZiBwc2V1ZG8tTk1JcyBtdWNoIGhpZ2hlciB0aGFuIGl0IHNob3Vs ZCBiZQo+ICh5b3UgdGFrZSBhIERTQiBTWSBvbiBlYWNoIGludGVycnVwdCB1bm1hc2tpbmcpLgo+ IAo+IElmIHlvdSBhcmUgbm90IHVzaW5nIDE6TiBkaXN0cmlidXRpb24gb2YgU1BJcyBvbiB0aGUg c2VjdXJlIHNpZGUsCj4gY29uc2lkZXIgdHVybmluZyB0aGF0IG9mZiBpbiB5b3VyIGZpcm13YXJl LiBUaGlzIHNob3VsZCBtYWtlIE5NSXMKPiBzbGlnaHRseSBtb3JlIHBsZWFzYW50IHRvIHVzZS4K ClRoYW5rcyBmb3IgdGhlIGhpbnQuIEkgc3BlYWsgdG8gdGhlIEJJT1MgZ3V5cy4KCkpvaG4KCl9f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fCkxpbnV4LW52bWUg bWFpbGluZyBsaXN0CkxpbnV4LW52bWVAbGlzdHMuaW5mcmFkZWFkLm9yZwpodHRwOi8vbGlzdHMu aW5mcmFkZWFkLm9yZy9tYWlsbWFuL2xpc3RpbmZvL2xpbnV4LW52bWUK