strange problem with virtio on guest with over 3648M RAM
Hello KVM developers!
We are experiencing a very strange problem: we have been testing Ubuntu Hardy Heron Server as a guest (kvm-68 on the host) and when using the virtio nic everything works fine until we give the guest more than 3648 MiB of RAM.
If we for example start with "-m 4096" then the ubuntu guest brings up eth0 but it is impossible to get a dhcp address and if one sets a static address no packets what so ever is leaving the guest.
So there seam to be a problem with the virtio guest drivers when there is more than 3648 MiB of ram available :), is there anyone else that have experienced the same problems or are there people running virtio on guest with more ram where everything is working ok?
This problem could be local to ubuntu but I don't know of any other distribution with virtio guest drivers out of the box.
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Henrik Holst skrev:
Quoted 11 lines
Hello KVM developers!
We are experiencing a very strange problem: we have been testing Ubuntu Hardy Heron Server as a guest (kvm-68 on the host) and when using the virtio nic everything works fine until we give the guest more than 3648 MiB of RAM.
If we for example start with "-m 4096" then the ubuntu guest brings up eth0 but it is impossible to get a dhcp address and if one sets a static address no packets what so ever is leaving the guest.
Quoted 7 lines
So there seam to be a problem with the virtio guest drivers when there is more than 3648 MiB of ram available :), is there anyone else that have experienced the same problems or are there people running virtio on guest with more ram where everything is working ok?
This problem could be local to ubuntu but I don't know of any other distribution with virtio guest drivers out of the box.
Forgot to mention that the e1000 guest drivers works perfectly fine regardless of the amount of ram on the guest.
/Henrik Holst
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Quoted 7 lines · Henrik Holst
Hello KVM developers!
We are experiencing a very strange problem: we have been testing Ubuntu Hardy Heron Server as a guest (kvm-68 on the host) and when using the virtio nic everything works fine until we give the guest more than 3648 MiB of RAM.
Quoted 9 lines
If we for example start with "-m 4096" then the ubuntu guest brings up eth0 but it is impossible to get a dhcp address and if one sets a static address no packets what so ever is leaving the guest.
So there seam to be a problem with the virtio guest drivers when there is more than 3648 MiB of ram available :), is there anyone else that have experienced the same problems or are there people running virtio on guest with more ram where everything is working ok?
It's a know bug. I have a fix for it locally that I'll send out today.
Regards,
Anthony Liguori
Quoted 13 lines
This problem could be local to ubuntu but I don't know of any other distribution with virtio guest drivers out of the box.
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Quoted 18 lines · Anthony Liguori
Quoted 7 lines · Henrik Holst
Hello KVM developers!
We are experiencing a very strange problem: we have been testing Ubuntu Hardy Heron Server as a guest (kvm-68 on the host) and when using the virtio nic everything works fine until we give the guest more than 3648 MiB of RAM.
Quoted 9 lines
If we for example start with "-m 4096" then the ubuntu guest brings up eth0 but it is impossible to get a dhcp address and if one sets a static address no packets what so ever is leaving the guest.
So there seam to be a problem with the virtio guest drivers when there is more than 3648 MiB of ram available :), is there anyone else that have experienced the same problems or are there people running virtio on guest with more ram where everything is working ok?
Quoted 5 lines
It's a know bug. I have a fix for it locally that I'll send out today.
Regards,
Anthony Liguori
Many thanks Anthony!
/Henrik Holst
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