Virtio drivers and FreeBSD 9.1

[Nicolas Roosen]

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Hello everybody,

I have some trouble with the following configuration:

- - a Samsung SSD 840 Pro drive of 128 GB
- - a Debian Wheezy (7.1) as a KVM host
- - multiple Debian 7.1 and FreeBSD 9.1 guests on top of it


I have installed the virtio drivers (from
http://people.freebsd.org/~kuriyama/virtio/) on all guests, and
configured the KVM domain.xml files accordingly.

Then I ran some I/O tests using iozone. And as you can see on the
results below, there is a big difference between the Debian guest and
the FreeBSD guest.

Is there any option I could have forgotten to set up in FreeBSD that
could explain this difference?


On the host server:

iozone -s 64M -r 4k -i 0 -i 1 -i 2

                                                random  random
KB  reclen   write rewrite    read    reread    read    write
65536    4  258532  553602   922146   969225 1523242  530324


On the FreeBSD guest:
						random  random
KB  reclen   write rewrite    read    reread    read    write
65536    4   61687  128261   574681   580237  537510   20690


On the Debian guest:
						random  random
KB  reclen   write rewrite    read    reread    read    write
65536    4  119604  481670   878853   935172 1328093  473255


Thank you.

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