From mboxrd@z Thu Jan 1 00:00:00 1970 From: Laurent Vivier Subject: Re: Couple of quetsions HD perf, mac address... Date: Tue, 03 Jul 2007 13:51:25 +0200 Message-ID: <468A383D.70005@bull.net> References: <468A1A3B.604@scarlet.be> Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="===============0046842034==" Cc: kvm-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org To: Benjamin Budts Return-path: In-Reply-To: <468A1A3B.604-rJAIWvhRp0CZIoH1IeqzKA@public.gmane.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: kvm-devel-bounces-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org Errors-To: kvm-devel-bounces-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org List-Id: kvm.vger.kernel.org This is an OpenPGP/MIME signed message (RFC 2440 and 3156) --===============0046842034== Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="------------enigC9EBD1499BE3A0B4F2190650" This is an OpenPGP/MIME signed message (RFC 2440 and 3156) --------------enigC9EBD1499BE3A0B4F2190650 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Benjamin Budts wrote: [snip] > 1* When i run hdparm -t /dev/sda1 I have 80-85Mbit/s read speed on my=20 > guest os (debian etch) >=20 > If I run it ''in'' a virtual machine (using also debian Etch with=20 > 2.6.21.5 kernel) I get : 28-35Mbits... >=20 > I even tried to put the image on a seperate disk to be able to have=20 > more, but I can't get more then 35Mbits out of it... >=20 > How can I up the disk performance without having to replace everything = > by SCSI hardware ? >=20 You can improve performance by using virtual SCSI disks. I post some benchchmarks with dbench on this list at the end of may (24/05). QEmu (and thus KVM) doesn't support natively SCSI disk for the PC virtual= machine. I post a patch the 1st of march on QEmu mailing list to add a "-= sda" parameter to use SCSI disk (but my approach was not approved by maintaine= rs). The problem with the virtual SCSI is you cannot boot on it because there = is no BIOS to manage it. But you can use it as storage and boot linux using the= parameter "-kernel" to load directly the kernel from the host disk. Regards, Laurent --=20 ------------- Laurent.Vivier-6ktuUTfB/bM@public.gmane.org -------------- "Any sufficiently advanced technology is indistinguishable from magic." - Arthur C. Clarke --------------enigC9EBD1499BE3A0B4F2190650 Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.7 (GNU/Linux) iD8DBQFGijhB9Kffa9pFVzwRAtB8AKCMg5T9d6CYL5J6ARyYqvwSkP2JBQCgwb59 ZFSWFdirGvbCqpXTXzSnq8c= =nX4J -----END PGP SIGNATURE----- --------------enigC9EBD1499BE3A0B4F2190650-- --===============0046842034== Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline ------------------------------------------------------------------------- This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ --===============0046842034== Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline _______________________________________________ kvm-devel mailing list kvm-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org https://lists.sourceforge.net/lists/listinfo/kvm-devel --===============0046842034==--