From owner-freebsd-virtualization@freebsd.org Sat Apr 18 14:51:58 2020 Return-Path: Delivered-To: freebsd-virtualization@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 CF9E12CBA01 for ; Sat, 18 Apr 2020 14:51:58 +0000 (UTC) (envelope-from freebsd@omnilan.de) Received: from mx0.gentlemail.de (mx0.gentlemail.de [IPv6:2a00:e10:2800::a130]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 494GBj5Jmnz4M7R for ; Sat, 18 Apr 2020 14:51:57 +0000 (UTC) (envelope-from freebsd@omnilan.de) Received: from mh0.gentlemail.de (ezra.dcm1.omnilan.net [IPv6:2a00:e10:2800::a135]) by mx0.gentlemail.de (8.14.5/8.14.5) with ESMTP id 03IEpng0088346 for ; Sat, 18 Apr 2020 16:51:49 +0200 (CEST) (envelope-from freebsd@omnilan.de) Received: from titan.inop.mo1.omnilan.net (s1.omnilan.de [217.91.127.234]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mh0.gentlemail.de (Postfix) with ESMTPSA id EA05F33D for ; Sat, 18 Apr 2020 16:51:48 +0200 (CEST) To: freebsd-virtualization@freebsd.org From: Harry Schmalzbauer Subject: =?UTF-8?Q?bhyve_11.1->stable/12_ZVOL-WinGuest_slowdown_=e2=80=93_r3?= =?UTF-8?Q?58848_far_beyond_imagination?= Organization: OmniLAN Message-ID: <3af0db9e-9044-5bbb-50d2-ef251ed231a1@omnilan.de> Date: Sat, 18 Apr 2020 16:51:48 +0200 User-Agent: Mozilla/5.0 (X11; FreeBSD amd64; rv:52.0) Gecko/20100101 Thunderbird/52.7.0 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit Content-Language: en-US X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.2.7 (mx0.gentlemail.de [IPv6:2a00:e10:2800::a130]); Sat, 18 Apr 2020 16:51:49 +0200 (CEST) X-Milter: Spamilter (Reciever: mx0.gentlemail.de; Sender-ip: ; Sender-helo: mh0.gentlemail.de; ) X-Rspamd-Queue-Id: 494GBj5Jmnz4M7R X-Spamd-Bar: ---- Authentication-Results: mx1.freebsd.org; dkim=none; dmarc=none; spf=pass (mx1.freebsd.org: domain of freebsd@omnilan.de designates 2a00:e10:2800::a130 as permitted sender) smtp.mailfrom=freebsd@omnilan.de X-Spamd-Result: default: False [-4.69 / 15.00]; ARC_NA(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; NEURAL_HAM_MEDIUM(-1.00)[-1.000,0]; FROM_HAS_DN(0.00)[]; R_SPF_ALLOW(-0.20)[+mx]; TO_MATCH_ENVRCPT_ALL(0.00)[]; MIME_GOOD(-0.10)[text/plain]; PREVIOUSLY_DELIVERED(0.00)[freebsd-virtualization@freebsd.org]; TO_DN_NONE(0.00)[]; RCPT_COUNT_ONE(0.00)[1]; HAS_ORG_HEADER(0.00)[]; RCVD_COUNT_THREE(0.00)[3]; RCVD_TLS_LAST(0.00)[]; NEURAL_HAM_LONG(-1.00)[-1.000,0]; DMARC_NA(0.00)[omnilan.de]; IP_SCORE(-2.39)[ip: (-9.21), ipnet: 2a00:e10:2800::/38(-4.58), asn: 61157(1.86), country: DE(-0.02)]; FROM_EQ_ENVFROM(0.00)[]; R_DKIM_NA(0.00)[]; MIME_TRACE(0.00)[0:+]; ASN(0.00)[asn:61157, ipnet:2a00:e10:2800::/38, country:DE]; MID_RHS_MATCH_FROM(0.00)[] X-BeenThere: freebsd-virtualization@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Discussion of various virtualization techniques FreeBSD supports." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 18 Apr 2020 14:51:58 -0000 Hello, after upgrading my ancient ivy-bridge (Xeon E3, no vAPIC CPU support) from 11.1 to stable/12 I noteced a quiet heavy slowdown of my windows guest (Server 2012R2). The guest-disk is a ZVOL backed virtio-blk device, which I suspected suffers from performance regressions – especially since I use them in volmode=dev. But then I found the guest spending almost one full vCPU cycles in interrupt handling during light SQL load; something I rarely see on windows.  No idea what caused the slowdown, but I remembered r358848 – which isn't MFCd yet, but I gave it a try. Word's can't describe the surprise.  Never imagined any Win-Guest on bhyve can feel like that… Thanks a lot to Sir Burmeister et. al. Hope this will land in stable/12 soon. Thanks, -Harry