Hi all,
I have done some more experiments and it does work when using a Centos
6.2 guest. Therefore, it is most likely a compatibility issues between
the guest and host virtio implementation.
I read somewhere there is some sort of compatibility mode for virtio but
could not find how to activate it. Is there a way to make these
different virtio host/guest implementations talk to each other?
Cheers
Erik
Erik Brakkee wrote:
Hi,
I am running a guest that exposes a NFS share to be used by a TViX
box. The TViX box is not that advanced and uses NFS over UDP instead
of TCP.
What I am seeing is that when I use the virtio network driver, the
TViX box cannot mount the filesystem. However, when I use rtl8139
instead, it can.
The problem is easily reproduced:
1. Create a guest that uses a virtio network interface (bridging setup)
2. Expose an NFS share on the guest
3. mount the NFS share using 'mount -o udp host:/share /localdir'
4. verify that the NFS share cannot be mounted.
5. Modify the guest to use rtl8139 device emulation and stop the guest
and start it
6. mount the NFS share using 'mount -o udp host:/share /localdir'
7. Verify tha the NFS share can be mounted
Now the bug reporting guidelines say that I should always use the
latest KVM version but compiling KVM from source and using that is not
really an option. The server is important enough not to mess around
with. Therefore, my question is whether this problem has been seen
before or not.
My configuration is as follows:
*Host*
centos 6.2
uname -a gives "Linux falcon.fritz.box 2.6.32-220.17.1.el6.x86_64 #1
SMP Wed May 16 00:01:37 BST 2012 x86_64 x86_64 x86_64 GNU/Linux"
KVM software: qemu-kvm-0.12.1.2-2.209.el6_2.5.x86_64
*Guest*
OpenSuSE 11.3
uname -a gives "Linux shikra 2.6.34.7-0.7-default #1 SMP 2010-12-13
11:13:53 +0100 x86_64 x86_64 x86_64 GNU/Linux"
I also see in the instructions I should try running qemu with some
alternative switches, but I am not running qemu directly. I am using
virt-manager and a domain.xml to configure how qemu runs. How should I
modify the domain.xml to help in troubleshooting this issue?
Cheers
Erik
PS. the domain.xml is attached.
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