From owner-freebsd-hackers@FreeBSD.ORG Fri Jul 20 12:51:09 2012 Return-Path: Delivered-To: freebsd-hackers@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 040A8106566B for ; Fri, 20 Jul 2012 12:51:09 +0000 (UTC) (envelope-from freebsd-hackers@m.gmane.org) Received: from plane.gmane.org (plane.gmane.org [80.91.229.3]) by mx1.freebsd.org (Postfix) with ESMTP id ACC928FC08 for ; Fri, 20 Jul 2012 12:51:08 +0000 (UTC) Received: from list by plane.gmane.org with local (Exim 4.69) (envelope-from ) id 1SsCfd-0004Go-E7 for freebsd-hackers@freebsd.org; Fri, 20 Jul 2012 14:51:01 +0200 Received: from lara.cc.fer.hr ([161.53.72.113]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Fri, 20 Jul 2012 14:51:01 +0200 Received: from ivoras by lara.cc.fer.hr with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Fri, 20 Jul 2012 14:51:01 +0200 X-Injected-Via-Gmane: http://gmane.org/ To: freebsd-hackers@freebsd.org From: Ivan Voras Date: Fri, 20 Jul 2012 14:50:50 +0200 Lines: 39 Message-ID: References: <50085193.6030203@gentoo.org> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="------------enigB843B65CBADBF2E7187E52BE" X-Complaints-To: usenet@dough.gmane.org X-Gmane-NNTP-Posting-Host: lara.cc.fer.hr User-Agent: Mozilla/5.0 (X11; FreeBSD amd64; rv:10.0) Gecko/20120213 Thunderbird/10.0 In-Reply-To: <50085193.6030203@gentoo.org> X-Enigmail-Version: 1.3.5 Subject: Re: Awful FreeBSD 9 block IO performance in KVM X-BeenThere: freebsd-hackers@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Technical Discussions relating to FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 20 Jul 2012 12:51:09 -0000 This is an OpenPGP/MIME signed message (RFC 2440 and 3156) --------------enigB843B65CBADBF2E7187E52BE Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable On 19/07/2012 20:27, Richard Yao wrote: > Dear Everyone, >=20 > FreeBSD 9 has awful block IO performance in KVM. I have experienced it > and others have experienced it. Someone posted slides to slideshare wit= h > benchmarks documenting it: >=20 > http://www.slideshare.net/TakeshiHasegawa1/runningfreebsdonlinuxkvm >=20 > Slides 13 and 20 are particular eye openers. Does anyone know what is w= rong? I'm interested in seeing if the difference is still large while writing to a raw device (dd of=3D/dev/xxx bs=3D1m count=3D1000) vs writing to the= file system. Can you test this? --------------enigB843B65CBADBF2E7187E52BE Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.19 (FreeBSD) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iEYEARECAAYFAlAJVCoACgkQ/QjVBj3/HSzzcQCeKWOyGCczi54Zi/YLR51iZDnx TakAnjDF3amHhoBbvdcR97F3sbW6Q8lH =7Ryh -----END PGP SIGNATURE----- --------------enigB843B65CBADBF2E7187E52BE--