From owner-freebsd-hackers@freebsd.org Fri Dec 6 08:58:51 2019 Return-Path: Delivered-To: freebsd-hackers@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id F40821C5FF3 for ; Fri, 6 Dec 2019 08:58:50 +0000 (UTC) (envelope-from wojtek@puchar.net) Received: from puchar.net (puchar.net [194.1.144.90]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 47Tmj54gMTz4Bnr for ; Fri, 6 Dec 2019 08:58:49 +0000 (UTC) (envelope-from wojtek@puchar.net) Received: Received: from 127.0.0.1 (localhost [127.0.0.1]) by puchar.net (8.15.2/8.15.2) with ESMTPS id xB68wg0w052997 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NO); Fri, 6 Dec 2019 09:58:42 +0100 (CET) (envelope-from puchar-wojtek@puchar.net) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=puchar.net; s=default; t=1575622723; bh=f8VAN/5a3h2IgDxUOhx73cSckywR7lPaxMIibgku4tU=; h=Date:From:To:cc:Subject:In-Reply-To:References; b=sNsHkSfnordccZ/dl24J1/Ie9BLUYC8GhkcQCQLDIdmfJbszNinrZ7l8+W2Mrv6Yl 22gLgi6xp2+c1rX6IiXX7NguQkwtIfrZbiac/qT5H3HRJFj4M4FuURq2owAo3lxB/5 IowNPiHYCPqy+IDhNGDDm/3BYWirNxZloxzw2G/0= Received: from localhost (puchar-wojtek@localhost) by puchar.net (8.15.2/8.15.2/Submit) with ESMTP id xB68wg9N052994; Fri, 6 Dec 2019 09:58:42 +0100 (CET) (envelope-from puchar-wojtek@puchar.net) Date: Fri, 6 Dec 2019 09:58:42 +0100 (CET) From: Wojciech Puchar To: "Rodney W. Grimes" cc: Wojciech Puchar , Darius Mihai , freebsd-hackers@freebsd.org Subject: Re: bhyve+windows 7 multicore performance In-Reply-To: <201912051924.xB5JOw7V045421@gndrsh.dnsmgr.net> Message-ID: References: <201912051924.xB5JOw7V045421@gndrsh.dnsmgr.net> User-Agent: Alpine 2.20 (BSF 67 2015-01-07) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII; format=flowed X-Rspamd-Queue-Id: 47Tmj54gMTz4Bnr X-Spamd-Bar: ---- Authentication-Results: mx1.freebsd.org; dkim=fail (rsa verify failed) header.d=puchar.net header.s=default header.b=sNsHkSfn; dmarc=none; spf=pass (mx1.freebsd.org: domain of wojtek@puchar.net designates 194.1.144.90 as permitted sender) smtp.mailfrom=wojtek@puchar.net X-Spamd-Result: default: False [-4.57 / 15.00]; ARC_NA(0.00)[]; NEURAL_HAM_MEDIUM(-1.00)[-1.000,0]; FROM_HAS_DN(0.00)[]; RCPT_COUNT_THREE(0.00)[4]; R_SPF_ALLOW(-0.20)[+mx]; R_DKIM_REJECT(1.00)[puchar.net:s=default]; MIME_GOOD(-0.10)[text/plain]; DMARC_NA(0.00)[puchar.net]; NEURAL_HAM_LONG(-1.00)[-1.000,0]; TO_DN_SOME(0.00)[]; TO_MATCH_ENVRCPT_SOME(0.00)[]; DKIM_TRACE(0.00)[puchar.net:-]; RCVD_IN_DNSWL_NONE(0.00)[90.144.1.194.list.dnswl.org : 127.0.10.0]; IP_SCORE(-3.27)[ip: (-8.63), ipnet: 194.1.144.0/24(-4.32), asn: 43476(-3.45), country: PL(0.07)]; FROM_EQ_ENVFROM(0.00)[]; MIME_TRACE(0.00)[0:+]; RCVD_TLS_LAST(0.00)[]; ASN(0.00)[asn:43476, ipnet:194.1.144.0/24, country:PL]; MID_RHS_MATCH_FROM(0.00)[]; RCVD_COUNT_TWO(0.00)[2] X-BeenThere: freebsd-hackers@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Technical Discussions relating to FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 06 Dec 2019 08:58:51 -0000 >>> since -P forces context switches when that instruction is >>> executed.? >>> >>> Darius >> Possibly. But for sure - this made things faster a lot. Actually close to >> bare metal performance. > > Does this close the issue of performance for you and I can remove this > thread from my list of active investigation? yes. thank you. i used -P before but for VMs with one or 2 threads and the problem was just not visible. It just became visible on 12 thread VM.