From owner-freebsd-stable@freebsd.org Sat Feb 4 09:54:44 2017 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 24731CCF3BA for ; Sat, 4 Feb 2017 09:54:44 +0000 (UTC) (envelope-from florian.ermisch@alumni.tu-berlin.de) Received: from mail-2.alumni.tu-berlin.de (mail-2.alumni.tu-berlin.de [130.149.5.29]) (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 D90D41041 for ; Sat, 4 Feb 2017 09:54:43 +0000 (UTC) (envelope-from florian.ermisch@alumni.tu-berlin.de) X-tubIT-Incoming-IP: 78.52.8.167 Received: from x4e3408a7.dyn.telefonica.de ([78.52.8.167] helo=floh-lg-g4.fritz.box) by mailbox.alumni.tu-berlin.de (exim-4.84_2) with esmtpsa [TLSv1.2:DHE-RSA-AES256-GCM-SHA384:256] id 1cZwxU-0005FM-A3; Sat, 04 Feb 2017 10:48:40 +0100 Date: Sat, 04 Feb 2017 10:48:38 +0100 In-Reply-To: References: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Subject: Re: Problem with FreeBSD as a XenServer Guest - how to debug? To: freebsd-stable@freebsd.org,Rainer Duffner From: Florian Ermisch Message-ID: <37CEE483-1901-4B8A-AB89-654D6C4DA6C7@alumni.tu-berlin.de> X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 04 Feb 2017 09:54:44 -0000 Hi Rainer, isn't Amazon AWS xen-based? I know Colin Percival (cperciva@) is running=20 tarsnap=2Ecom on AWS, maybe he knows how=20 to tune it properly? Looks like he's the one providing FreeBSD=20 images for AWS, too: https://aws=2Eamazon=2Ecom/marketplace/pp/B01LWSWRED/ Amazon is probably running a heavily patched version of Xen but looking at the images'=20 sysctls & stuff and running one on your Xen- Server might provide some insights - or at least datapoints=2E And then there's DTrace to dive into the=20 kernel's inner workings*=E2=80=A6 Oh, does Xen still provide emulation for other storage controllers like SATA or SAS? If so you may get an at least bearable performance using those=2E Regards, Florian Am 4=2E Februar 2017 01:12:11 MEZ schrieb Rainer Duffner : > Hi, >=20 > I=E2=80=99ve opened a PR on this: >=20 > https://bugs=2Efreebsd=2Eorg/bugzilla/show_bug=2Ecgi?id=3D212681 >=20 > and asked on freebsd-virtualization=2E But nothing came out of it=2E >=20 > Basically, I/O is very slow inside the FreeBSD guest=2E Linux guests are > OK=2E > FreeBSD 10 or 11 doesn=E2=80=99t make a difference=2E > Haven=E2=80=99t been able to try 12=2E >=20 >=20 > How can one debug this? >=20 >=20 >=20 >=20 > Rainer > _______________________________________________ > freebsd-stable@freebsd=2Eorg mailing list > https://lists=2Efreebsd=2Eorg/mailman/listinfo/freebsd-stable > To unsubscribe, send any mail to > "freebsd-stable-unsubscribe@freebsd=2Eorg"