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=-4.3 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, 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 F26C6C433DB for ; Wed, 3 Mar 2021 11:26:49 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id BF76764EEC for ; Wed, 3 Mar 2021 11:26:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1357786AbhCCLYZ (ORCPT ); Wed, 3 Mar 2021 06:24:25 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54120 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234570AbhCCCkZ (ORCPT ); Tue, 2 Mar 2021 21:40:25 -0500 Received: from mail-pg1-x52c.google.com (mail-pg1-x52c.google.com [IPv6:2607:f8b0:4864:20::52c]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2FEE4C061797; Tue, 2 Mar 2021 18:39:41 -0800 (PST) Received: by mail-pg1-x52c.google.com with SMTP id h4so15192891pgf.13; Tue, 02 Mar 2021 18:39:41 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=subject:from:to:cc:references:message-id:date:user-agent :mime-version:in-reply-to:content-language:content-transfer-encoding; bh=EGVG4WkVl5pFpBjbmr9YGkCtEq1i3vWKYOcjQG1R/v0=; b=aS2Uf5dAX41dzyG77xCrLK1TGmya8ecK4+YhOlzcqqsTSkEuXC56qYFBPV0qZ5AokF U1IZ2uNq4U6kIX9oRa42X00OpuSFbq2FjtuDXhprPoLZZer5qI2u1ucLXVEDWEJix57b slwzL4TMyf6hYBH2vyHO6DV7n+1ob4g5K4AnsnHsmcb5Sj58xXxhD/n7+9afq76e5GwW UcTNyVtZ+70xaz+a6rwbuiJExyp3ySWrDbu3ethvOT0WXZdB2VBXYp3ey9sMoIk2TzXT DFw0zMf4+go0l5NdnamfzDJqp1S4hKinnX01Kh3f85oojOfVluEPIwk+jkLAQipNLpmT 2XaQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:from:to:cc:references:message-id:date :user-agent:mime-version:in-reply-to:content-language :content-transfer-encoding; bh=EGVG4WkVl5pFpBjbmr9YGkCtEq1i3vWKYOcjQG1R/v0=; b=cfuXUxenT2e3KCDejA/ZlO7BD3CI17rmGDbHWI3UqKYdDO63hs/rkHs2ngGIeqHrw7 kAqxVEbZExlTeeFw7vn2VuELCmoM53HqDxKinMdKxU5j6oVRtipUMGe06f7WQAKXsQ78 Doj46jBMRkOn/GIS6AqzLAACzMXl8KqOhVFOUlH31jXBfLyUPt6CwmWxL2Qawi54ebc6 nbkDVQXoVHFIaE9FcaTuk2ZmPxP2FGcKzInVTul0ZeWE9e/40PGDwGQWkixr9JOiNsow 97Go5K6NurZ2pPXXuN24Ui9rZEJ4wlpACeGjjz4ytS9V2ynziYmiSszMAKSQmyAAfHBj IiOg== X-Gm-Message-State: AOAM530VxAFz+fRRLMh8UIQ9/xw2pFuq0wml7cIxH3gWF+5osJnRFROy u6W5fDPzuOuqAjywL8T8og== X-Google-Smtp-Source: ABdhPJyks6SodkO5sqbqFQUQZ/9OziaBwHkURJyyyVxkHE4I9p4DH0accCxHjQEUk8hg9uGmf6yrPg== X-Received: by 2002:a63:741:: with SMTP id 62mr1302468pgh.70.1614739180726; Tue, 02 Mar 2021 18:39:40 -0800 (PST) Received: from [127.0.0.1] ([203.205.141.56]) by smtp.gmail.com with ESMTPSA id v1sm9289197pgh.17.2021.03.02.18.39.37 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 02 Mar 2021 18:39:40 -0800 (PST) Subject: Re: [PATCH] kvm: lapic: add module parameters for LAPIC_TIMER_ADVANCE_ADJUST_MAX/MIN From: Haiwei Li To: linux-kernel@vger.kernel.org, kvm@vger.kernel.org Cc: pbonzini@redhat.com, seanjc@google.com, vkuznets@redhat.com, wanpengli@tencent.com, jmattson@google.com, joro@8bytes.org, Haiwei Li References: <20210303020946.26083-1-lihaiwei.kernel@gmail.com> Message-ID: <03239d81-df56-a6c9-c79d-c14d22f62705@gmail.com> Date: Wed, 3 Mar 2021 10:39:29 +0800 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.16; rv:78.0) Gecko/20100101 Thunderbird/78.8.0 MIME-Version: 1.0 In-Reply-To: <20210303020946.26083-1-lihaiwei.kernel@gmail.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 21/3/3 10:09, lihaiwei.kernel@gmail.com wrote: > From: Haiwei Li > > In my test environment, advance_expire_delta is frequently greater than > the fixed LAPIC_TIMER_ADVANCE_ADJUST_MAX. And this will hinder the > adjustment. Supplementary details: I have tried to backport timer related features to our production kernel. After completed, i found that advance_expire_delta is frequently greater than the fixed value. It's necessary to trun the fixed to dynamically values. -- Haiwei Li