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=-2.3 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=no 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 14EC0C4360D for ; Mon, 9 Sep 2019 02:31:00 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id E113120578 for ; Mon, 9 Sep 2019 02:30:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1733015AbfIICaz (ORCPT ); Sun, 8 Sep 2019 22:30:55 -0400 Received: from mx1.redhat.com ([209.132.183.28]:41970 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1732560AbfIICaz (ORCPT ); Sun, 8 Sep 2019 22:30:55 -0400 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.11]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 278F160ACF; Mon, 9 Sep 2019 02:30:55 +0000 (UTC) Received: from [10.72.12.61] (ovpn-12-61.pek2.redhat.com [10.72.12.61]) by smtp.corp.redhat.com (Postfix) with ESMTP id 7B5E560166; Mon, 9 Sep 2019 02:30:24 +0000 (UTC) Subject: Re: [PATCH 2/2] vhost: re-introducing metadata acceleration through kernel virtual address From: Jason Wang To: "Michael S. Tsirkin" Cc: kvm@vger.kernel.org, virtualization@lists.linux-foundation.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, jgg@mellanox.com, aarcange@redhat.com, jglisse@redhat.com, linux-mm@kvack.org, James Bottomley , Christoph Hellwig , David Miller , linux-arm-kernel@lists.infradead.org, linux-parisc@vger.kernel.org References: <20190905122736.19768-1-jasowang@redhat.com> <20190905122736.19768-3-jasowang@redhat.com> <20190908063618-mutt-send-email-mst@kernel.org> <1cb5aa8d-6213-5fce-5a77-fcada572c882@redhat.com> Message-ID: <868bfaed-ede4-6da8-0247-af2a03ea121d@redhat.com> Date: Mon, 9 Sep 2019 10:30:20 +0800 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.8.0 MIME-Version: 1.0 In-Reply-To: <1cb5aa8d-6213-5fce-5a77-fcada572c882@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 10.5.11.11 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.30]); Mon, 09 Sep 2019 02:30:55 +0000 (UTC) Sender: linux-parisc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-parisc@vger.kernel.org On 2019/9/9 上午10:18, Jason Wang wrote: >>> >>> On a elder CPU Sandy Bridge without SMAP support. TX PPS doesn't see >>> any difference. >> Why is not Kaby Lake with SMAP off the same as Sandy Bridge? > > > I don't know, I guess it was because the atomic is l Sorry, I meant atomic costs less for Kaby Lake. Thanks