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=ham 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 32786C32789 for ; Tue, 6 Nov 2018 21:35:36 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id F2CF32086A for ; Tue, 6 Nov 2018 21:35:35 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org F2CF32086A Authentication-Results: mail.kernel.org; dmarc=fail (p=quarantine dis=none) header.from=ti.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730556AbeKGHCs (ORCPT ); Wed, 7 Nov 2018 02:02:48 -0500 Received: from fllv0015.ext.ti.com ([198.47.19.141]:44276 "EHLO fllv0015.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726530AbeKGHCs (ORCPT ); Wed, 7 Nov 2018 02:02:48 -0500 Received: from fllv0035.itg.ti.com ([10.64.41.0]) by fllv0015.ext.ti.com (8.15.2/8.15.2) with ESMTP id wA6LYuTV050953; Tue, 6 Nov 2018 15:34:56 -0600 Received: from DLEE114.ent.ti.com (dlee114.ent.ti.com [157.170.170.25]) by fllv0035.itg.ti.com (8.15.2/8.15.2) with ESMTPS id wA6LYuTr066766 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=FAIL); Tue, 6 Nov 2018 15:34:56 -0600 Received: from DLEE107.ent.ti.com (157.170.170.37) by DLEE114.ent.ti.com (157.170.170.25) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.1466.3; Tue, 6 Nov 2018 15:34:56 -0600 Received: from dlep32.itg.ti.com (157.170.170.100) by DLEE107.ent.ti.com (157.170.170.37) with Microsoft SMTP Server (version=TLS1_0, cipher=TLS_RSA_WITH_AES_256_CBC_SHA) id 15.1.1466.3 via Frontend Transport; Tue, 6 Nov 2018 15:34:55 -0600 Received: from [128.247.59.147] (ileax41-snat.itg.ti.com [10.172.224.153]) by dlep32.itg.ti.com (8.14.3/8.13.8) with ESMTP id wA6LYtEB020675; Tue, 6 Nov 2018 15:34:55 -0600 To: CC: , Linux ARM Mailing List From: Grygorii Strashko Subject: arm64 + ARM64_64K_PAGES=y Message-ID: <1ab7ee03-64fe-384a-c88f-f6d519b965db@ti.com> Date: Tue, 6 Nov 2018 15:34:55 -0600 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.2.1 MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8"; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-EXCLAIMER-MD-CONFIG: e1e8a2fd-e40a-4ac6-ac9b-f7e9cc9ee180 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi All, Do anybody tried to use ARM64 RT with 76K pages enabled? My attempt shows that enabling CONFIG_ARM64_64K_PAGES=y increases latencies by ~30% cyclictest -n -m -Sp98 -q -D2m with CONFIG_ARM64_64K_PAGES=y T: 0 ( 772) P:98 I:1000 C: 120000 Min: 7 Act: 13 Avg: 10 Max: 85 T: 1 ( 773) P:98 I:1500 C: 79998 Min: 7 Act: 13 Avg: 10 Max: 71 T: 2 ( 774) P:98 I:2000 C: 59997 Min: 7 Act: 11 Avg: 11 Max: 64 T: 3 ( 775) P:98 I:2500 C: 47996 Min: 7 Act: 14 Avg: 12 Max: 66 cyclictest -n -m -Sp98 -q -D2m with CONFIG_ARM64_64K_PAGES=n T: 0 ( 697) P:98 I:1000 C: 120000 Min: 7 Act: 10 Avg: 9 Max: 38 T: 1 ( 698) P:98 I:1500 C: 79987 Min: 7 Act: 10 Avg: 10 Max: 32 T: 2 ( 699) P:98 I:2000 C: 59981 Min: 7 Act: 14 Avg: 11 Max: 46 T: 3 ( 700) P:98 I:2500 C: 47977 Min: 6 Act: 11 Avg: 10 Max: 45 -- regards, -grygorii