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[209.132.183.28]) by mx.google.com with ESMTPS id r15si634708qtn.95.2019.05.05.02.20.43 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Sun, 05 May 2019 02:20:43 -0700 (PDT) Received-SPF: pass (google.com: domain of jasowang@redhat.com designates 209.132.183.28 as permitted sender) client-ip=209.132.183.28; Authentication-Results: mx.google.com; spf=pass (google.com: domain of jasowang@redhat.com designates 209.132.183.28 as permitted sender) smtp.mailfrom=jasowang@redhat.com; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=redhat.com Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.phx2.redhat.com [10.5.11.14]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 50F6C3091749; Sun, 5 May 2019 09:20:42 +0000 (UTC) Received: from [10.72.12.197] (ovpn-12-197.pek2.redhat.com [10.72.12.197]) by smtp.corp.redhat.com (Postfix) with ESMTP id EC3AF5DA5B; Sun, 5 May 2019 09:20:32 +0000 (UTC) Subject: Re: [RFC PATCH V3 0/6] vhost: accelerate metadata access To: mst@redhat.com, kvm@vger.kernel.org, virtualization@lists.linux-foundation.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org Cc: peterx@redhat.com, aarcange@redhat.com, James.Bottomley@hansenpartnership.com, hch@infradead.org, davem@davemloft.net, jglisse@redhat.com, linux-mm@kvack.org, linux-arm-kernel@lists.infradead.org, linux-parisc@vger.kernel.org, christophe.de.dinechin@gmail.com, jrdr.linux@gmail.com References: <20190423055420.26408-1-jasowang@redhat.com> From: Jason Wang Message-ID: <831c343f-c547-f68c-19fe-d89e8f259d87@redhat.com> Date: Sun, 5 May 2019 17:20:31 +0800 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.6.1 MIME-Version: 1.0 In-Reply-To: <20190423055420.26408-1-jasowang@redhat.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit Content-Language: en-US X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.41]); Sun, 05 May 2019 09:20:42 +0000 (UTC) X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On 2019/4/23 下午1:54, Jason Wang wrote: > This series tries to access virtqueue metadata through kernel virtual > address instead of copy_user() friends since they had too much > overheads like checks, spec barriers or even hardware feature > toggling. This is done through setup kernel address through direct > mapping and co-opreate VM management with MMU notifiers. > > Test shows about 23% improvement on TX PPS. TCP_STREAM doesn't see > obvious improvement. Ping. Comments are more than welcomed. Thanks