From owner-freebsd-hackers@FreeBSD.ORG Sun Jul 22 03:56:20 2012 Return-Path: Delivered-To: hackers@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52]) by hub.freebsd.org (Postfix) with ESMTP id 825AB106564A; Sun, 22 Jul 2012 03:56:20 +0000 (UTC) (envelope-from ryao@gentoo.org) Received: from smtp.gentoo.org (smtp.gentoo.org [140.211.166.183]) by mx1.freebsd.org (Postfix) with ESMTP id 595F38FC12; Sun, 22 Jul 2012 03:56:20 +0000 (UTC) Received: from [192.168.1.2] (pool-72-89-250-138.nycmny.fios.verizon.net [72.89.250.138]) (using TLSv1 with cipher ECDHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) (Authenticated sender: ryao) by smtp.gentoo.org (Postfix) with ESMTPSA id 5A6C01B4165; Sun, 22 Jul 2012 03:56:19 +0000 (UTC) Message-ID: <500B795B.7000307@gentoo.org> Date: Sat, 21 Jul 2012 23:54:03 -0400 From: Richard Yao User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:10.0.5) Gecko/20120628 Thunderbird/10.0.5 MIME-Version: 1.0 To: Wojciech Puchar References: <50085193.6030203@gentoo.org> <5009DB2A.7070408@gentoo.org> <500A13A6.7030503@gentoo.org> In-Reply-To: X-Enigmail-Version: 1.3.5 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="------------enigFA60BE77987BC02D52E16480" Cc: Adrian Chadd , "hackers@FreeBSD.org" , current@freebsd.org, ivoras@freebsd.org 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: Sun, 22 Jul 2012 03:56:20 -0000 This is an OpenPGP/MIME signed message (RFC 2440 and 3156) --------------enigFA60BE77987BC02D52E16480 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable On 07/21/2012 04:15 AM, Wojciech Puchar wrote: >> da0: Fixed Direct Access SCSI-5 device >> da0: 3.300MB/s transfers >> da0: Command Queueing enabled >> da0: 409600MB (838860800 512 byte sectors: 255H 63S/T 52216C) >> >> It does not explain why virtio is slow though, although I still need t= o >> test virtio against the latest code. I will do ivan's raw block test >> against virtio-blk, mainly because there is no point in doing it again= st >> a device whose transfers have been capped to 3.3MB/sec. > are you sure it is really capped? > i am not. just emulated sym device reports low speed. > _______________________________________________ > freebsd-hackers@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-hackers > To unsubscribe, send any mail to "freebsd-hackers-unsubscribe@freebsd.o= rg" You are right. It is not capped at that speed: root@freebsd:/root # dd if=3D/dev/zero of=3D/dev/da1 bs=3D16384 count=3D2= 62144 262144+0 records in 262144+0 records out 4294967296 bytes transferred in 615.840721 secs (6974153 bytes/sec) --------------enigFA60BE77987BC02D52E16480 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 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iQIcBAEBAgAGBQJQC3leAAoJECDuEZm+6ExkIaoP/AlnAKsNV/TKyZE06jLnptUr vB+ta9hq3V3wnSbQbWKYTdCbqRP5Rsc6Q6t5ixPND/VmtEEFStQDtYN3qWKQauwT fGwOGBNCyAnRtbAhtaLGOaIzTmVzj4LOdEfzDQJxkIg1xdoERBxrO0w+tm5Axun2 FaTMZlrRpalp17whe+gcHv0RZGR73B4uRbKtXKkSt/38mCoOX7ghWMvgkCd3OTC3 tf8xbRtPBKk6GzozdELEPkQBE0NDADmUjFGCUGqz7ogkgFDSp7rR0YJeukmVosIZ x4KLXlEiDls49+3SCLRIRP8XYhZ9IkR1+XJNIvQi+MLltrj98XwjbBuzKDXbjp8t VGiGZEfLfoz88wfqtjA6Af2xcSiAg1W5pXdz1NB1Fg63YrHrRQSMb17wW0RvY4i9 5mroZbqAQmrgMSHN74/+5O8eMOCgo8d+IqxSy3pHrEd+Z+fH9NyVmSU+AByjLU2f nwITMDfd1MqvnNQbRTP80JjSDha5DYT5l56S8XvgmB5q9gJ8j+qsI2qXtmNBQDye W9ngQiyiXU+SSAdyPPajIYt9rCCvw8itrE23wuq23TEecbO2EvvycrIs6n+IG/U9 HQWhxOSS3BabsykiLD3eBVLCFwK1Wiux+nXpfEwOYHruM49bR8OdTbaZUb4YyQ1K aatz/dHc8PjO1JGg+iSd =dodR -----END PGP SIGNATURE----- --------------enigFA60BE77987BC02D52E16480--