From owner-freebsd-xen@freebsd.org Wed Sep 14 13:01:58 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 5EFE0BDA82F for ; Wed, 14 Sep 2016 13:01:58 +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 4EA7C1398 for ; Wed, 14 Sep 2016 13:01:58 +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 u8ED1vr4018298 for ; Wed, 14 Sep 2016 13:01:58 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: Wed, 14 Sep 2016 13:01:57 +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: cc 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: Wed, 14 Sep 2016 13:01:58 -0000 https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D212681 karl@pielorz.com changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |karl@pielorz.com --- Comment #1 from karl@pielorz.com --- Hi, We run XenServer 6.5 and 7 here - with a range of FreeBSD versions (mostly = 10.x now). We've not noticed any really low I/O performance. How are you running dc3dd? - So I can try and install / replicate this here. We have seen that I/O behaves differently under XenServer than it does on b= are metal (which is obvious - i.e. local SATA SSD vs. Multipath iSCSI [or simil= ar]) you will see differences (even just with 'mapped through XenServer' "Local Storage"). It could be dc3dd / the stuff you're running is a particularly 'bad case' f= or the I/O. e.g. In an equally 'synthetic' test - a regular "dd if=3D/dev/zero of=3Dtest.dat bs=3D64k count=3D10240" on our our test pool here (which has = two paths iSCSI over Gigabit) we get around 220Mbyte/sec to a FreeBSD DomU. That may well be a best case - and you may well have hit some worst cases. -Karl --=20 You are receiving this mail because: You are the assignee for the bug.=