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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 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 Cc: Robin Murphy , linux-kernel@vger.kernel.org, linux-nvme@lists.infradead.org, Ming Lei , iommu@lists.linux-foundation.org, Will Deacon , linux-arm-kernel@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" T24gMjIvMDcvMjAyMSAxMzo1MywgTWFyYyBaeW5naWVyIHdyb3RlOgo+IEhpIEpvaG4sCj4gCj4g Wy4uLl0KPiAKPj4gwqDCoMKgIFlvdXIga2VybmVsIGxvZyBzaG91bGQgc2hvdzoKPj4gwqDCoMKg IFvCoMKgwqAgMC4wMDAwMDBdIEdJQ3YzOiBQc2V1ZG8tTk1JcyBlbmFibGVkIHVzaW5nIGZvcmNl ZCBJQ0NfUE1SX0VMMQo+PiBzeW5jaHJvbmlzYXRpb24KPiAKPiBVbnJlbGF0ZWQsIGJ1dCB5b3Ug c2VlbSB0byBiZSBydW5uaW5nIHdpdGggSUNDX0NUTFJfRUwzLlBNSEUgc2V0LAo+IHdoaWNoIG1h a2VzIHRoZSBvdmVyaGVhZCBvZiBwc2V1ZG8tTk1JcyBtdWNoIGhpZ2hlciB0aGFuIGl0IHNob3Vs ZCBiZQo+ICh5b3UgdGFrZSBhIERTQiBTWSBvbiBlYWNoIGludGVycnVwdCB1bm1hc2tpbmcpLgo+ IAo+IElmIHlvdSBhcmUgbm90IHVzaW5nIDE6TiBkaXN0cmlidXRpb24gb2YgU1BJcyBvbiB0aGUg c2VjdXJlIHNpZGUsCj4gY29uc2lkZXIgdHVybmluZyB0aGF0IG9mZiBpbiB5b3VyIGZpcm13YXJl LiBUaGlzIHNob3VsZCBtYWtlIE5NSXMKPiBzbGlnaHRseSBtb3JlIHBsZWFzYW50IHRvIHVzZS4K ClRoYW5rcyBmb3IgdGhlIGhpbnQuIEkgc3BlYWsgdG8gdGhlIEJJT1MgZ3V5cy4KCkpvaG4KX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX18KaW9tbXUgbWFpbGlu ZyBsaXN0CmlvbW11QGxpc3RzLmxpbnV4LWZvdW5kYXRpb24ub3JnCmh0dHBzOi8vbGlzdHMubGlu dXhmb3VuZGF0aW9uLm9yZy9tYWlsbWFuL2xpc3RpbmZvL2lvbW11