Open Stack

There is a known  bug  about qemu virtio driver  on ubuntu12.04 which has
 the same effect as you described.
see https://bugs.launchpad.net/ubuntu/+source/qemu-kvm/+bug/997978.
this has been fixed   by ubuntu. if it is caused by this bug. you just need
update you  qemu-kvm . to the version  "1.0+noroms-0ubuntu14.3" .
hope this helps you.


2012/11/7 延生 付 <willfly0620 at yahoo.com.cn>

> hi,
>
> Could you let us know your stress test environment and procedures?
> I didn't encounter this issue before.
>
> Regards,
> willfu
>
>   ------------------------------
> *发件人：* 한승진 <yongiman at gmail.com>
> *收件人：* openstack at lists.launchpad.net
> *发送日期：* 2012年11月7日, 星期三, 上午 9:20
> *主题:* [Openstack] vm is disconnected when I use VirtIO network driver
>
> Hi.
>
> We use VirtIO as a network driver and use KVM as a hypervisor.
>
> Now, we have been having a instance stress test. (disk,cpu,network else..)
>
> When we had a stress test, several instances are disconnected and down.
>
> After rebooting the instance, we can access the instance again.
>
> We doubted the network driver.
>
> We change network driver from virtio to e1000.
>
> There were no instances that were down or disconnected.
>
> However, performance of e1000 is terrible..
>
> Who have experienced like this situation?
>
> VirtIO is still unstable?
>
> Please tell us the reason and how to resolve this problem.
>
>
>
>
>
>
>
>
>
>
>
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>
>
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>


-- 
Yaguang Tang
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