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[209.51.188.17]) by mx.google.com with ESMTPS id a25si3058958qtw.111.2020.03.12.10.11.53 for (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Thu, 12 Mar 2020 10:11:53 -0700 (PDT) Received-SPF: pass (google.com: domain of qemu-devel-bounces+alex.bennee=linaro.org@nongnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; Authentication-Results: mx.google.com; dkim=fail header.i=@redhat.com header.s=mimecast20190719 header.b=X5l+4ayU; spf=pass (google.com: domain of qemu-devel-bounces+alex.bennee=linaro.org@nongnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom="qemu-devel-bounces+alex.bennee=linaro.org@nongnu.org"; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=redhat.com Received: from localhost ([::1]:46260 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jCRNA-0003XW-Sb for alex.bennee@linaro.org; Thu, 12 Mar 2020 13:11:52 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:38652) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jCRE9-0002QN-7G for qemu-devel@nongnu.org; Thu, 12 Mar 2020 13:02:34 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1jCRE7-0000tt-De for qemu-devel@nongnu.org; Thu, 12 Mar 2020 13:02:32 -0400 Received: from us-smtp-delivery-1.mimecast.com ([205.139.110.120]:22161 helo=us-smtp-1.mimecast.com) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1jCRE7-0000rb-8D for qemu-devel@nongnu.org; Thu, 12 Mar 2020 13:02:31 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1584032550; 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=yDAn56p1JorUdIBrrLQJNk/GIMybbrppb3b4dS2ACFg=; b=X5l+4ayUEPUSZVh6W4GiLVKcmDeZt4MiUnFruyejGZZiE5wyuxr6c80eid62l8C5NhSV8w jmAPqbzM5tLAwTrY70wjH9h4N6cBAzJYn4ae5c5JHbugBRA3Cg1g09L7rMFiHqvQuNEjEQ 8x55+6trZG7BpupjdsYcGIhoBmtvfX8= 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-386-CfFOaPOxNCix2KHRQQt4pQ-1; Thu, 12 Mar 2020 13:02:25 -0400 X-MC-Unique: CfFOaPOxNCix2KHRQQt4pQ-1 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 31472803960; Thu, 12 Mar 2020 17:02:24 +0000 (UTC) Received: from work-vm (ovpn-116-106.ams2.redhat.com [10.36.116.106]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 33E8F8FBE1; Thu, 12 Mar 2020 17:02:21 +0000 (UTC) Date: Thu, 12 Mar 2020 17:02:19 +0000 From: "Dr. David Alan Gilbert" To: Eric Blake Subject: Re: [PATCH] migration/throttle: Add throttle-trig-thres migration parameter Message-ID: <20200312170219.GK3211@work-vm> References: <20200221025727.63808-1-zhukeqian1@huawei.com> <2db47b97-729f-4ccb-dab2-585771acc2fe@redhat.com> MIME-Version: 1.0 In-Reply-To: <2db47b97-729f-4ccb-dab2-585771acc2fe@redhat.com> User-Agent: Mutt/1.13.3 (2020-01-12) X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 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: 205.139.110.120 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: Juan Quintela , qemu-devel@nongnu.org, Markus Armbruster , qemu-arm@nongnu.org, wanghaibin.wang@huawei.com, Keqian Zhu Errors-To: qemu-devel-bounces+alex.bennee=linaro.org@nongnu.org Sender: "Qemu-devel" X-TUID: 4kYkXYspcrna * Eric Blake (eblake@redhat.com) wrote: > On 2/20/20 8:57 PM, Keqian Zhu wrote: > > Currently, if the bytes_dirty_period is more than the 50% of > > bytes_xfer_period, we start or increase throttling. > >=20 > > If we make this percentage higher, then we can tolerate higher > > dirty rate during migration, which means less impact on guest. > > The side effect of higher percentage is longer migration time. > >=20 > > We can configure this parameter to switch between migration time > > firt or guest performance first. The default value is 50. > >=20 > > Signed-off-by: Keqian Zhu > > --- > > Cc: Juan Quintela > > Cc: "Dr. David Alan Gilbert" > > Cc: Eric Blake > > Cc: Markus Armbruster > > --- >=20 > > +++ b/qapi/migration.json > > @@ -524,6 +524,10 @@ > > # compression, so set the decompress-threads to = the number about 1/4 > > # of compress-threads is adequate. > > # > > +# @throttle-trig-thres: The ratio of bytes_dirty_period and bytes_xfer= _period to > > +# trigger throttling. It is expressed as percent= age. The > > +# default value is 50. (Since 5.0) > > +# >=20 > Abbreviating feels odd; can you please spell this out as > throttle-trigger-threshold? >=20 > Can the threshold exceed 100%? Note the code checks for that and disallows it, only allowing 1..99 Dave >=20 > --=20 > Eric Blake, Principal Software Engineer > Red Hat, Inc. +1-919-301-3226 > Virtualization: qemu.org | libvirt.org -- Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK