From owner-freebsd-stable@freebsd.org Sat Feb 4 17:00:25 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 9DE0CCD0595 for ; Sat, 4 Feb 2017 17:00:25 +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 EA90913DA for ; Sat, 4 Feb 2017 17:00:24 +0000 (UTC) (envelope-from rainer@ultra-secure.de) Received: (Haraka outbound); Sat, 04 Feb 2017 18:00:22 +0100 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 1064C2B9-87B2-4799-8798-80895AE5084E.1 envelope-from (authenticated bits=0); Sat, 04 Feb 2017 18:00:19 +0100 Content-Type: text/plain; charset=utf-8 Mime-Version: 1.0 (Mac OS X Mail 9.3 \(3124\)) Subject: Re: Problem with FreeBSD as a XenServer Guest - how to debug? From: Rainer Duffner In-Reply-To: <37CEE483-1901-4B8A-AB89-654D6C4DA6C7@alumni.tu-berlin.de> Date: Sat, 4 Feb 2017 18:00:16 +0100 Cc: freebsd-stable@freebsd.org Content-Transfer-Encoding: quoted-printable Message-Id: <9D72A1D4-C728-4405-8101-11734D092615@ultra-secure.de> References: <37CEE483-1901-4B8A-AB89-654D6C4DA6C7@alumni.tu-berlin.de> To: Florian Ermisch 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=14 total_conn=1 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, URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.1 X-Haraka-Karma: score: 6, good: 2213, bad: 1, connections: 2610, history: 2212, asn_score: 736, asn_connections: 823, asn_good: 736, asn_bad: 0, pass:asn, asn_all_good, relaying 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 17:00:25 -0000 > Am 04.02.2017 um 10:48 schrieb Florian Ermisch = : >=20 > Hi Rainer, >=20 > isn't Amazon AWS xen-based? > I know Colin Percival (cperciva@) is running=20 > tarsnap.com on AWS, maybe he knows how=20 > to tune it properly? It=E2=80=99s not a question of tuning. It=E2=80=99s a factor of 5 that FreeBSD is slower. On SSDs, it=E2=80=99s = 10 to 15x. > Looks like he's the one providing FreeBSD=20 > images for AWS, too: https://aws.amazon.com/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. >=20 > And then there's DTrace to dive into the=20 > kernel's inner workings*=E2=80=A6 >=20 Yes, but I don=E2=80=99t even know there to start. My knowledge of Dtrace is very, very limited. > 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. FreeBSD 10 and 11 contain the =E2=80=9Eoptimal=E2=80=9C support for Xen = DomU support out-of-the box, AFAIK (the documentation / wiki for Xen is = in a horrible state IMO).