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=-2.5 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 B7BC5C06513 for ; Thu, 4 Jul 2019 12:27:27 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (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 8D0512064A for ; Thu, 4 Jul 2019 12:27:27 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 8D0512064A Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:45258 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.86_2) (envelope-from ) id 1hj0pi-0007jH-Pr for qemu-devel@archiver.kernel.org; Thu, 04 Jul 2019 08:27:26 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:40359) by lists.gnu.org with esmtp (Exim 4.86_2) (envelope-from ) id 1hj0oZ-0006ro-Vh for qemu-devel@nongnu.org; Thu, 04 Jul 2019 08:26:16 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1hj0oY-0001bv-Uj for qemu-devel@nongnu.org; Thu, 04 Jul 2019 08:26:15 -0400 Received: from mail-wm1-f67.google.com ([209.85.128.67]:36913) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1hj0oY-0001ay-Nd for qemu-devel@nongnu.org; Thu, 04 Jul 2019 08:26:14 -0400 Received: by mail-wm1-f67.google.com with SMTP id f17so5960287wme.2 for ; Thu, 04 Jul 2019 05:26:14 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:cc:references:from:message-id:date :user-agent:mime-version:in-reply-to:content-language :content-transfer-encoding; bh=QQwRpMMrJfYO8143GKfLP5w/nwUehuI9LxF7b29DHDY=; b=UWgY7qjXk/GTtNKPCcTI+onBeV9jbf9hXixxTIhmObm0htUxAy8ucKmxHuINdcH5zx dFlekVGa4AO1j+SQavvme0mEAAN6vUBKTr3Ll9LYdGRjSx9D1wUbwDWLNh5ocaWxqUAT JBIHaedl96hBzpEqGbFwlgsfV0HS9EPIhHUTXclLUXARM0O1Efy+FuhzGAVIt+w8olAS uLc1RWOU8yMG06j7cGAmxSkkKXTkST2u4kKApPwxuf3bgSIZT46O1AT77GMjGi4HOgsV Z3jJiLt14M50wchxqW/SyEZhHyLNupo6HMDf3qpwn4J94a147doDkHhFHsgt4z3xcFLO yyvQ== X-Gm-Message-State: APjAAAW8+s3L+xYpbajQMpcg2rCfzSFuETJXxABlDJUC0fhKn8trcmC1 OldJMWe1fTXuNQMO17NTr2vEsw== X-Google-Smtp-Source: APXvYqxmm1Y+I7Obxqups7a9aS9879BbMBBjJAIjJiFdKS552LjBLmu1et3ZJ5GmTKKMQO0rJoYWYQ== X-Received: by 2002:a1c:4b1a:: with SMTP id y26mr12416906wma.105.1562243173584; Thu, 04 Jul 2019 05:26:13 -0700 (PDT) Received: from [10.201.49.68] (nat-pool-mxp-u.redhat.com. [149.6.153.187]) by smtp.gmail.com with ESMTPSA id p11sm6289374wrm.53.2019.07.04.05.26.10 (version=TLS1_3 cipher=AEAD-AES128-GCM-SHA256 bits=128/128); Thu, 04 Jul 2019 05:26:10 -0700 (PDT) To: Stefan Hajnoczi , =?UTF-8?Q?Philippe_Mathieu-Daud=c3=a9?= References: <20190704055150.4899-1-clg@kaod.org> <20190704101345.GC1609@stefanha-x1.localdomain> From: Paolo Bonzini Message-ID: Date: Thu, 4 Jul 2019 14:26:09 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.7.2 MIME-Version: 1.0 In-Reply-To: <20190704101345.GC1609@stefanha-x1.localdomain> Content-Type: text/plain; charset=windows-1252 Content-Language: en-US Content-Transfer-Encoding: 8bit X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 209.85.128.67 Subject: Re: [Qemu-devel] [PATCH for 4.1] aspeed/timer: Provide back-pressure information for short periods X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Peter Maydell , Andrew Jeffery , qemu-devel@nongnu.org, qemu-arm@nongnu.org, Joel Stanley , =?UTF-8?Q?C=c3=a9dric_Le_Goater?= Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 04/07/19 12:13, Stefan Hajnoczi wrote: > On Thu, Jul 04, 2019 at 11:26:53AM +0200, Philippe Mathieu-Daudé wrote: >> CC'ing Stefan & Paolo for a non-ARM view on this... > > I'm not familiar with the various clock smoothing techniques implemented > in QEMU and KVM, but this looks okay given that Linux guests expect > this. Yeah, even KVM applies a minimum period of 200us to the x86 LAPIC timer. Paolo