From owner-freebsd-stable@freebsd.org Wed Aug 17 21:14:47 2016 Return-Path: Delivered-To: freebsd-stable@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 8B20CBBDD5B for ; Wed, 17 Aug 2016 21:14:47 +0000 (UTC) (envelope-from rainer@ultra-secure.de) Received: from connect.ultra-secure.de (connect.ultra-secure.de [88.198.71.201]) by mx1.freebsd.org (Postfix) with ESMTP id D57E61C49 for ; Wed, 17 Aug 2016 21:14:46 +0000 (UTC) (envelope-from rainer@ultra-secure.de) Received: (Haraka outbound); Wed, 17 Aug 2016 23:14:44 +0200 Authentication-Results: connect.ultra-secure.de; iprev=pass; auth=pass (plain); spf=none smtp.mailfrom=ultra-secure.de Received-SPF: None (connect.ultra-secure.de: domain of ultra-secure.de does not designate 217.71.83.52 as permitted sender) receiver=connect.ultra-secure.de; identity=mailfrom; client-ip=217.71.83.52; helo=[192.168.1.200]; envelope-from= Received: from [192.168.1.200] (217-071-083-052.ip-tech.ch [217.71.83.52]) by connect.ultra-secure.de (Haraka/2.6.2-toaster) with ESMTPSA id A19DDB41-2844-48DD-9EF5-395F771AFAEB.1 envelope-from (authenticated bits=0) (version=TLSv1/SSLv3 cipher=AES256-SHA verify=NO); Wed, 17 Aug 2016 23:14:38 +0200 From: Rainer Duffner Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Subject: I/O is very slow for FreeBSD 10.3 amd64 guest running on Citrix XenServer 6.5 Message-Id: <3FD6AFE8-BF63-4705-B826-FD8CD0A2F731@ultra-secure.de> Date: Wed, 17 Aug 2016 23:14:37 +0200 To: freebsd-stable Mime-Version: 1.0 (Mac OS X Mail 9.3 \(3124\)) X-Mailer: Apple Mail (2.3124) X-Haraka-GeoIP: EU, CH, 451km X-Haraka-ASN: 24951 X-Haraka-GeoIP-Received: X-Haraka-ASN: 24951 217.71.80.0/20 X-Haraka-ASN-CYMRU: asn=24951 net=217.71.80.0/20 country=CH assignor=ripencc date=2003-08-07 X-Haraka-FCrDNS: 217-071-083-052.ip-tech.ch X-Haraka-p0f: os="Mac OS X " link_type="DSL" distance=12 total_conn=9 shared_ip=N X-Spam-Checker-Version: SpamAssassin 3.4.1 (2015-04-28) on spamassassin X-Spam-Level: X-Spam-Status: No, score=-2.9 required=5.0 tests=ALL_TRUSTED,BAYES_00 autolearn=ham autolearn_force=no version=3.4.1 X-Haraka-Karma: score: 6, good: 964, bad: 1, connections: 1197, history: 963, asn_score: 445, asn_connections: 453, asn_good: 445, asn_bad: 0, pass:asn, asn_all_good, relaying X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 17 Aug 2016 21:14:47 -0000 Hi, I had to realize this week that my VMs on Citrix XenServer are very = slow, compared to Linux. I=E2=80=99m getting maybe 8 or 10 MB/s, wheres an Ubuntu 14 guest gets = 110+ MB/s (Megabyte). Independent of the filesystem, just wiping the disks with dc3dd. This went unnoticed, because not much I/O is done in these VMs. But = recently, a customer complained and I had to look into it. The VM is running stock 10.3-RELEASE-p6. The OS-type is set to FreeBSD 10 64 bit. Same thing happens with FreeBSD 11-RC1. This is what I get in 11-RC1 from sysctl: (freebsd11 ) 0 # sysctl -a |grep xen kern.vm_guest: xen device xenpci vfs.pfs.vncache.maxentries: 0 dev.xenbusb_back.0.%parent: xenstore0 dev.xenbusb_back.0.%pnpinfo: dev.xenbusb_back.0.%location: dev.xenbusb_back.0.%driver: xenbusb_back dev.xenbusb_back.0.%desc: Xen Backend Devices dev.xenbusb_back.%parent: dev.xn.0.xenstore_peer_path: /local/domain/0/backend/vif/245/0 dev.xn.0.xenbus_peer_domid: 0 dev.xn.0.xenbus_connection_state: Connected dev.xn.0.xenbus_dev_type: vif dev.xn.0.xenstore_path: device/vif/0 dev.xn.0.%parent: xenbusb_front0 dev.xbd.1.xenstore_peer_path: /local/domain/0/backend/vbd3/245/768 dev.xbd.1.xenbus_peer_domid: 0 dev.xbd.1.xenbus_connection_state: Connected dev.xbd.1.xenbus_dev_type: vbd dev.xbd.1.xenstore_path: device/vbd/768 dev.xbd.1.%parent: xenbusb_front0 dev.xbd.0.xenstore_peer_path: /local/domain/0/backend/vbd3/245/832 dev.xbd.0.xenbus_peer_domid: 0 dev.xbd.0.xenbus_connection_state: Connected dev.xbd.0.xenbus_dev_type: vbd dev.xbd.0.xenstore_path: device/vbd/832 dev.xbd.0.%parent: xenbusb_front0 dev.xenbusb_front.0.%parent: xenstore0 dev.xenbusb_front.0.%pnpinfo: dev.xenbusb_front.0.%location: dev.xenbusb_front.0.%driver: xenbusb_front dev.xenbusb_front.0.%desc: Xen Frontend Devices dev.xenbusb_front.%parent: dev.xs_dev.0.%parent: xenstore0 dev.xctrl.0.%parent: xenstore0 dev.xenballoon.0.%parent: xenstore0 dev.xenballoon.0.%pnpinfo: dev.xenballoon.0.%location: dev.xenballoon.0.%driver: xenballoon dev.xenballoon.0.%desc: Xen Balloon Device dev.xenballoon.%parent: dev.debug.0.%parent: xenpv0 dev.privcmd.0.%parent: xenpv0 dev.evtchn.0.%parent: xenpv0 dev.xenstore.0.%parent: xenpv0 dev.xenstore.0.%pnpinfo: dev.xenstore.0.%location: dev.xenstore.0.%driver: xenstore dev.xenstore.0.%desc: XenStore dev.xenstore.%parent: dev.xen_et.0.%parent: xenpv0 dev.xen_et.0.%pnpinfo: dev.xen_et.0.%location: dev.xen_et.0.%driver: xen_et dev.xen_et.0.%desc: Xen PV Clock dev.xen_et.%parent: dev.granttable.0.%parent: xenpv0 dev.xenpv.0.%parent: nexus0 dev.xenpv.0.%pnpinfo: dev.xenpv.0.%location: dev.xenpv.0.%driver: xenpv dev.xenpv.0.%desc: Xen PV bus dev.xenpv.%parent: dev.xenpci.0.%parent: pci0 dev.xenpci.0.%pnpinfo: vendor=3D0x5853 device=3D0x0001 subvendor=3D0x5853 = subdevice=3D0x0001 class=3D0x010000 dev.xenpci.0.%location: slot=3D3 function=3D0 dbsf=3Dpci0:0:3:0 = handle=3D\_SB_.PCI0.S18_ dev.xenpci.0.%driver: xenpci dev.xenpci.0.%desc: Xen Platform Device dev.xenpci.%parent: dev.xen.xsd_kva: 18446735281894703104 dev.xen.xsd_port: 3 dev.xen.balloon.high_mem: 0 dev.xen.balloon.low_mem: 0 dev.xen.balloon.hard_limit: 18446744073709551615 dev.xen.balloon.driver_pages: 0 dev.xen.balloon.target: 2097152 dev.xen.balloon.current: 2096128 I=E2=80=99ve tried switching the =E2=80=9EOS Type=E2=80=9C to something = like =E2=80=9Eother PV=E2=80=9C and get a bit more throughput. But = nowhere near enough to make this useful. Over at freebsd-xen, Roger thinks it looks right from the FreeBSD-side. I=E2=80=99m not the administrator of the Xen-Server itself (it=E2=80=99s = part of an Apache CloudStack private cloud cluster setup), but I can = have pretty much any setting checked/tried I need.