From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-1.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id AC903C004C9 for ; Sun, 5 May 2019 09:20:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 800C32082F for ; Sun, 5 May 2019 09:20:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727174AbfEEJUm (ORCPT ); Sun, 5 May 2019 05:20:42 -0400 Received: from mx1.redhat.com ([209.132.183.28]:49678 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726965AbfEEJUm (ORCPT ); Sun, 5 May 2019 05:20:42 -0400 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) Sender: linux-parisc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-parisc@vger.kernel.org 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