From owner-freebsd-xen@freebsd.org Thu Sep 15 08:23:30 2016 Return-Path: Delivered-To: freebsd-xen@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 CB30BBDC11F for ; Thu, 15 Sep 2016 08:23:30 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from kenobi.freebsd.org (kenobi.freebsd.org [IPv6:2001:1900:2254:206a::16:76]) (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 A0EFE12AF for ; Thu, 15 Sep 2016 08:23:30 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from bugs.freebsd.org ([127.0.1.118]) by kenobi.freebsd.org (8.15.2/8.15.2) with ESMTP id u8F8NTNY087125 for ; Thu, 15 Sep 2016 08:23:30 GMT (envelope-from bugzilla-noreply@freebsd.org) From: bugzilla-noreply@freebsd.org To: freebsd-xen@FreeBSD.org Subject: [Bug 212681] I/O is slow for FreeBSD DOMu on XenServer Date: Thu, 15 Sep 2016 08:23:30 +0000 X-Bugzilla-Reason: AssignedTo X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: Base System X-Bugzilla-Component: kern X-Bugzilla-Version: 10.3-RELEASE X-Bugzilla-Keywords: performance X-Bugzilla-Severity: Affects Only Me X-Bugzilla-Who: karl@pielorz.com X-Bugzilla-Status: New X-Bugzilla-Resolution: X-Bugzilla-Priority: --- X-Bugzilla-Assigned-To: freebsd-xen@FreeBSD.org X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: Message-ID: In-Reply-To: References: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: https://bugs.freebsd.org/bugzilla/ Auto-Submitted: auto-generated MIME-Version: 1.0 X-BeenThere: freebsd-xen@freebsd.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Discussion of the freebsd port to xen - implementation and usage List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 15 Sep 2016 08:23:30 -0000 https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D212681 --- Comment #8 from karl@pielorz.com --- (In reply to rainer from comment #7) Our config here is very similar - HP Proliant DL380 Gen -9- though, with lo= cal SAS disks - which we use for 'Local Storage' for XenServer, and then iSCSI = off to a Synology NAS we use for primary storage of our VM's. >On local storage, the realworld-test is even slower. This troubles me, as we don't see that - but we are running the test on un-contended local storage (you don't say if you are). The times you show for that last dd run - seem to vary quite a lot: 1342177280 bytes transferred in 22.239869 secs (60350053 bytes/sec) 1342177280 bytes transferred in 38.072567 secs (35253133 bytes/sec) 1342177280 bytes transferred in 5.782933 secs (232092820 bytes/sec) 1342177280 bytes transferred in 7.891797 secs (170072452 bytes/sec) 1342177280 bytes transferred in 12.598706 secs (106532947 bytes/sec) 1342177280 bytes transferred in 7.917661 secs (169516892 bytes/sec) 13421772800 bytes transferred in 147.423047 secs (91042568 bytes/sec) Especially that last one. How busy is the node? / local disks? At this stage I'd be tempted to re-run the tests while on FreeBSD looking at the output of something like: iostat -x 1 (which will show what FreeBSD thinks the disk service time, % busy etc. are= ) - and on Dom0 providing the local storage running: iostat -x 1 | egrep -e "(^Device)|(^sd*)" Which will do the equivalent for Xen. Things to look out for are high % busy, and service time / queue depths. At this point I'm not sure filling the ticket with reams of debug / command output is helping much - it might be better to close this ticket - and reve= rt to email to see if we can narrow things down to a possible cause, before re-opening the ticket again with more specific information. -Karl --=20 You are receiving this mail because: You are the assignee for the bug.=