Received: by 2002:a05:6a10:17d3:0:0:0:0 with SMTP id hz19csp3434851pxb; Wed, 14 Apr 2021 05:39:03 -0700 (PDT) X-Google-Smtp-Source: ABdhPJwDUmKhreOMAyeR6dmxFcrsK28KqICBrCkISSgRDNB4T178E1DKQ3aPsJgQrj3pHjO/qmeq X-Received: by 2002:a17:90b:2314:: with SMTP id mt20mr3447720pjb.99.1618403943804; Wed, 14 Apr 2021 05:39:03 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1618403943; cv=none; d=google.com; s=arc-20160816; b=CWXZ510lHxdBHUKC28xmctBI/7i/PrUyaUBU3dG14nN4b8q2Ky15RrN691GoxUTTRU WcEssa5q3yM3KQv8qBP1Lb2yEKocUcrOdeb66U0HZQcOhRJnuvicdgq2mmVTQGKRvb6D dkB6juV67lHNOcJcuN9u/xxhRBCI950BsvuUCWNApaiL++q3wVlWQ8A6fPr65KKHb7KL yj9cwe/k5V62oSZVxEmK6P5DhfO371tkq/fUV4zd7c1fxy4Sw/KPdo/v9VXKYmTHy1vK 5T+1Pz8Az2ALgoLAXTgz8NyVDtUjViVIWVNN4JJuRU+RRjMzl03qu7UehgT1PSJ8ogkY hiIQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:content-transfer-encoding:in-reply-to :mime-version:user-agent:date:message-id:from:references:cc:to :subject; bh=uRUFfuep+kNxwNNVcEvNKctZ0MJjW78dtKsDUCiB1XI=; b=EZHe+IKsnmCC26oTWMq50B8A2i9XKm7xOOVZatpfWQyJK9qn2cMEwf2iBMuHzdZBRh bDc8C8Sy4u+FyHzJVGVxr7fANG5XfJYyADlEjiCRVO9Q0dZ2Hf64qIwLf+KJs3a1wScB P/xj1LR0Kt8zCoj2bDwyvqbgd50Mzv2B8/knl6z93o54jex9ybzVJqdX6JDwPIfdfscQ PbIdHUj8i+4DcNy6IwhQYausE9GI0lvrGNsq9YDAnRH1iQifqjjGqfmfNZPF/z90JUdf +SByJkq65Ata3YwZSfDw0N5hUxrQJv85lyebeP4BEI9v+hWNlu8IJ+yPgDV9cfI1WngM lahA== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=huawei.com Return-Path: Received: from vger.kernel.org (vger.kernel.org. [23.128.96.18]) by mx.google.com with ESMTP id p6si19097097pgg.162.2021.04.14.05.38.51; Wed, 14 Apr 2021 05:39:03 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=huawei.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231452AbhDNFZ4 (ORCPT + 99 others); Wed, 14 Apr 2021 01:25:56 -0400 Received: from szxga07-in.huawei.com ([45.249.212.35]:17329 "EHLO szxga07-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230312AbhDNFZ4 (ORCPT ); Wed, 14 Apr 2021 01:25:56 -0400 Received: from DGGEMS403-HUB.china.huawei.com (unknown [172.30.72.60]) by szxga07-in.huawei.com (SkyGuard) with ESMTP id 4FKrTw06r5zB0gt; Wed, 14 Apr 2021 13:23:16 +0800 (CST) Received: from [10.174.177.246] (10.174.177.246) by DGGEMS403-HUB.china.huawei.com (10.3.19.203) with Microsoft SMTP Server id 14.3.498.0; Wed, 14 Apr 2021 13:25:31 +0800 Subject: Re: [PATCH] x86: Accelerate copy_page with non-temporal in X86 To: Borislav Petkov CC: , , , , , References: <3f28adee-8214-fa8e-b368-eaf8b193469e@huawei.com> <20210413110137.GD16519@zn.tnic> <20210413145315.GF16519@zn.tnic> From: Kemeng Shi Message-ID: <7854092f-f37a-f95c-132a-1b2896d582fc@huawei.com> Date: Wed, 14 Apr 2021 13:25:20 +0800 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:60.0) Gecko/20100101 Thunderbird/60.5.0 MIME-Version: 1.0 In-Reply-To: <20210413145315.GF16519@zn.tnic> Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit X-Originating-IP: [10.174.177.246] X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org on 2021/4/13 22:53, Borislav Petkov wrote: > I thought "should be better" too last time when I measured rep; movs vs > NT stores but actual measurements showed no real difference. Mabye the NT stores make difference when store to slow dimms, like the persistent memory I just tested. Also, it likely reduces unnecessary cache load and flush, and benifits the running processes which have data cached. -- Best wishes Kemeng Shi