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[209.132.183.28]) by mx.google.com with ESMTPS id l1si4549607qvn.149.2019.06.09.20.51.03 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Sun, 09 Jun 2019 20:51:04 -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-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id D9A5D3082B15; Mon, 10 Jun 2019 03:50:57 +0000 (UTC) Received: from [10.72.12.206] (ovpn-12-206.pek2.redhat.com [10.72.12.206]) by smtp.corp.redhat.com (Postfix) with ESMTP id 1AB5660BEC; Mon, 10 Jun 2019 03:50:46 +0000 (UTC) Subject: Re: [PATCH net-next 0/6] vhost: accelerate metadata access To: "Michael S. Tsirkin" Cc: kvm@vger.kernel.org, virtualization@lists.linux-foundation.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, peterx@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: <20190524081218.2502-1-jasowang@redhat.com> <20190605162631-mutt-send-email-mst@kernel.org> From: Jason Wang Message-ID: Date: Mon, 10 Jun 2019 11:50:45 +0800 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.7.0 MIME-Version: 1.0 In-Reply-To: <20190605162631-mutt-send-email-mst@kernel.org> Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit Content-Language: en-US X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.45]); Mon, 10 Jun 2019 03:50:58 +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 2019/6/6 上午4:27, Michael S. Tsirkin wrote: > On Fri, May 24, 2019 at 04:12:12AM -0400, Jason Wang wrote: >> Hi: >> >> 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 like SMAP. 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. >> >> Thanks > Thanks this is queued for next. > > Did you want to rebase and repost packed ring support on top? > IIUC it's on par with split ring with these patches. > > Yes, it's on the way. Thanks