VM speed benchmark

[T o n g <mlist4suntong@yahoo.com>]

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)
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