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=-5.3 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,NICE_REPLY_A,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 0B887C433B4 for ; Wed, 14 Apr 2021 05:25:39 +0000 (UTC) Received: from ml01.01.org (ml01.01.org [198.145.21.10]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 7A59B613C0 for ; Wed, 14 Apr 2021 05:25:38 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 7A59B613C0 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=huawei.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-nvdimm-bounces@lists.01.org Received: from ml01.vlan13.01.org (localhost [IPv6:::1]) by ml01.01.org (Postfix) with ESMTP id 3A5BF100F225D; Tue, 13 Apr 2021 22:25:38 -0700 (PDT) Received-SPF: Pass (mailfrom) identity=mailfrom; client-ip=45.249.212.35; helo=szxga07-in.huawei.com; envelope-from=shikemeng@huawei.com; receiver= Received: from szxga07-in.huawei.com (szxga07-in.huawei.com [45.249.212.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ml01.01.org (Postfix) with ESMTPS id 336D2100F2257 for ; Tue, 13 Apr 2021 22:25:35 -0700 (PDT) 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 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> X-Originating-IP: [10.174.177.246] X-CFilter-Loop: Reflected Message-ID-Hash: D7LAN65Z6TCSQTA47D2OHIF5HACCJDCH X-Message-ID-Hash: D7LAN65Z6TCSQTA47D2OHIF5HACCJDCH X-MailFrom: shikemeng@huawei.com X-Mailman-Rule-Hits: nonmember-moderation X-Mailman-Rule-Misses: dmarc-mitigation; no-senders; approved; emergency; loop; banned-address; member-moderation CC: tglx@linutronix.de, mingo@redhat.com, x86@kernel.org, hpa@zytor.com, linux-kernel@vger.kernel.org, linux-nvdimm@lists.01.org X-Mailman-Version: 3.1.1 Precedence: list List-Id: "Linux-nvdimm developer list." Archived-At: List-Archive: List-Help: List-Post: List-Subscribe: List-Unsubscribe: Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit 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 _______________________________________________ Linux-nvdimm mailing list -- linux-nvdimm@lists.01.org To unsubscribe send an email to linux-nvdimm-leave@lists.01.org