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=-7.4 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 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 5ED80C352A3 for ; Tue, 11 Feb 2020 17:50:53 +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 2E89D20661 for ; Tue, 11 Feb 2020 17:50:53 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="SjzH70fu" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 2E89D20661 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]:54630 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1j1ZgS-0007Au-CK for qemu-devel@archiver.kernel.org; Tue, 11 Feb 2020 12:50:52 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:38806) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1j1Zdq-0004jU-Fv for qemu-devel@nongnu.org; Tue, 11 Feb 2020 12:48:11 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1j1Zdn-0003M8-Bc for qemu-devel@nongnu.org; Tue, 11 Feb 2020 12:48:08 -0500 Received: from us-smtp-2.mimecast.com ([205.139.110.61]:52058 helo=us-smtp-delivery-1.mimecast.com) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1j1Zdm-0003IN-Ne for qemu-devel@nongnu.org; Tue, 11 Feb 2020 12:48:07 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1581443285; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=wHIK+IUQ7Bhn/dm4uCHzoBDYxpQmm2w1eMkChDlMgr8=; b=SjzH70fumKRxFFYHQE6stX+YrENv6iniw7EKTXsFwrYreF64D435yLt+Y1CozO+n8ucStw z9oFeML7T5YVEm2fVzyPrihqR5vc/apCRv92u4eTT9RGzTWZJf8FivxcniT3eJROCKxTde 9IkKagoj5F7ebkKjesALqyTrCEpaAe4= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-410-5cZUI5QDPuWIaxAcltJ0Fw-1; Tue, 11 Feb 2020 12:48:01 -0500 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.11]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 12C1B8017CC; Tue, 11 Feb 2020 17:48:00 +0000 (UTC) Received: from work-vm (unknown [10.36.118.42]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 03A6F88854; Tue, 11 Feb 2020 17:47:58 +0000 (UTC) Date: Tue, 11 Feb 2020 17:47:56 +0000 From: "Dr. David Alan Gilbert" To: Daniel Cho , chen.zhang@intel.com, zhang.zhanghailiang@huawei.com Subject: Re: The issues about architecture of the COLO checkpoint Message-ID: <20200211174756.GA2798@work-vm> References: MIME-Version: 1.0 In-Reply-To: User-Agent: Mutt/1.13.3 (2020-01-12) X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 X-MC-Unique: 5cZUI5QDPuWIaxAcltJ0Fw-1 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: quoted-printable Content-Disposition: inline X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 205.139.110.61 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: qemu-devel@nongnu.org Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" cc'ing in COLO people: * Daniel Cho (danielcho@qnap.com) wrote: > Hi everyone, > We have some issues about setting COLO feature. Hope somebody could > give us some advice. >=20 > Issue 1: > We dynamic to set COLO feature for PVM(2 core, 16G memory), but the > Primary VM will pause a long time(based on memory size) for waiting SVM > start. Does it have any idea to reduce the pause time? >=20 >=20 > Issue 2: > In https://github.com/qemu/qemu/blob/master/migration/colo.c#L503, > could we move start_vm() before Line 488? Because at first checkpoint PVM > will wait for SVM's reply, it cause PVM stop for a while. >=20 > We set the COLO feature on running VM, so we hope the running VM cou= ld > continuous service for users. > Do you have any suggestions for those issues? >=20 > Best regards, > Daniel Cho -- Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK