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=-2.0 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, 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 BD323C2D0C2 for ; Fri, 3 Jan 2020 17:00:13 +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 8CEAD206DB for ; Fri, 3 Jan 2020 17:00:13 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="U68Luhnm" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 8CEAD206DB 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]:54560 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1inQJ1-0001E1-RP for qemu-devel@archiver.kernel.org; Fri, 03 Jan 2020 12:00:11 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:40219) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1inQHa-0008NO-Di for qemu-devel@nongnu.org; Fri, 03 Jan 2020 11:58:44 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1inQHZ-0003XQ-52 for qemu-devel@nongnu.org; Fri, 03 Jan 2020 11:58:42 -0500 Received: from us-smtp-1.mimecast.com ([205.139.110.61]:57395 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 1inQHY-0003T8-Tc for qemu-devel@nongnu.org; Fri, 03 Jan 2020 11:58:41 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1578070720; h=from:from:reply-to: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=ecFjSAQ8WCbyZvUgQ+S+gT7tmqzgddPzqMB6UKfZYuI=; b=U68LuhnmETHSNC0qIhcJsMUYiAiD/0HWhS6h7Cpb7E/G5FIeqPuKgSvgwsOI0GhIS6nlGr gT/KdAX0jRDMaXqOkzPRR/0NJgG3At4bSL71mSsjok4JYwge1aw0JhAYLA6gwzdaTNya7S yINZRWtbG9O3E3wI0a4kyzNgl+2RUcY= 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-354-6kw3-8m8OwyxD_cnmm7euA-1; Fri, 03 Jan 2020 11:58:38 -0500 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.phx2.redhat.com [10.5.11.14]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id A4A9F593A7 for ; Fri, 3 Jan 2020 16:58:37 +0000 (UTC) Received: from redhat.com (ovpn-112-41.ams2.redhat.com [10.36.112.41]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 52A5B5D9D6; Fri, 3 Jan 2020 16:58:35 +0000 (UTC) Date: Fri, 3 Jan 2020 16:58:32 +0000 From: Daniel =?utf-8?B?UC4gQmVycmFuZ8Op?= To: Juan Quintela Subject: Re: [PATCH v2 01/10] migration: Increase default number of multifd channels to 16 Message-ID: <20200103165832.GU2753983@redhat.com> References: <20191218020119.3776-1-quintela@redhat.com> <20191218020119.3776-2-quintela@redhat.com> MIME-Version: 1.0 In-Reply-To: <20191218020119.3776-2-quintela@redhat.com> User-Agent: Mutt/1.12.1 (2019-06-15) X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 X-MC-Unique: 6kw3-8m8OwyxD_cnmm7euA-1 X-Mimecast-Spam-Score: 0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Content-Disposition: inline X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] 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: , Reply-To: Daniel =?utf-8?B?UC4gQmVycmFuZ8Op?= Cc: Laurent Vivier , Thomas Huth , Eduardo Habkost , Markus Armbruster , qemu-devel@nongnu.org, Paolo Bonzini , "Dr. David Alan Gilbert" Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On Wed, Dec 18, 2019 at 03:01:10AM +0100, Juan Quintela wrote: > We can scale much better with 16, so we can scale to higher numbers. What was the test scenario showing such scaling ? In the real world I'm sceptical that virt hosts will have 16 otherwise idle CPU cores available that are permissible to use for migration, or indeed whether they'll have network bandwidth available to allow 16 cores to saturate the link. Regards, Daniel --=20 |: https://berrange.com -o- https://www.flickr.com/photos/dberrange= :| |: https://libvirt.org -o- https://fstop138.berrange.com= :| |: https://entangle-photo.org -o- https://www.instagram.com/dberrange= :|