On Mon, Jan 31, 2011 at 01:45, T o n g <mlist4sunt...@yahoo.com> wrote:
> Hi, > > Talking about VM, some prefer virtulbox, some VMWare. Don't know how many > of you prefer kvm. I'm wondering if you could do the speed benchmark of > your preferred VM, and compare the result to that of your host. > > The reason that I'm asking -- recently I noticed that my kvm is extremely > slow, its disk access seems at least 10 times slower (*12 hours* to > restore a 600M partition?!). Googling revealed that's a known problem. > e.g., > http://blog.kagesenshi.org/2008/03/qemu-slow-disk-throughput.html > > "... I uses Qemu for hosting the guest OS for my development environment. > > For 2 days, I keep wondering why Zope/Plone loads damn slow on the qemu > machine eventhough I have allocated both cores of the processor, and > 512RAM for it. 15 minutes simply to start up is really not desirable. I > kept on investigating and guess what: > > [root@unapcict ~]# /sbin/hdparm -t /dev/hda > > /dev/hda: > Timing buffered disk reads: 18 MB in 3.03 seconds = 5.95 MB/sec > > Just for a comparison, the host hdd's speed: > > [root@Nobuyuki ~]# /sbin/hdparm -t /dev/sdc > > /dev/sdc: > Timing buffered disk reads: 174 MB in 3.01 seconds = 57.71 MB/sec > > Darn.. So, thats what the reason. . . " > > See, it *IS* at least 10 times slower. > > Please comment. > > Thanks > > -- > Tong (remove underscore(s) to reply) > http://xpt.sourceforge.net/techdocs/ > http://xpt.sourceforge.net/tools/ > > > -- > To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org > with a subject of "unsubscribe". Trouble? Contact > listmas...@lists.debian.org > Archive: http://lists.debian.org/ii4gtl$1r1$1...@dough.gmane.org > http://edin.no-ip.com/blog/hswong3i/libvirt-kvm-debian-mini-howto > Take a look at libvirt. It is defined to take care of the network/IO problems of virtual machines. http://www.libvirt.org/drvqemu.html http://edin.no-ip.com/blog/hswong3i/libvirt-kvm-debian-mini-howto
