[Xen-users] Re: domU network fails under load - vif breaks

[Paul <xensource@xxxxxxxxxxx>]

> On Sep 1, 2008, at 8:57 AM, Paul wrote:
>
>   
>
>     At a certain point that I have not established exactly, the
>     network load takes out the pv network. For example, if I initiate
>     a bittorrent session in a pv domU, I get a slow build up of
>     network load, and then connectivity is lost to both of the pv
>     domU's. If I console into them, they cannot ping outside the
>     network, but they can ping their own interfaces. A tcpdump on the
>     dom0 physical shows no traffic. However, during all this, the hvm
>     domains are able to use their network connections without issues. 
>
> I have experienced the same issue with Ubuntu 8.04. The only solution 
> I have found is to limit the rate of the nic so that it doesn't reach 
> a transfer rate that breaks the networking.
> Pepe
>   
Thanks Pepe.  My last test showed the network breaking at 3.6Mbs  - too 
slow to lower the nic rate, and having networking running that slow 
would make the vm unusable for its purpose.
I have upgraded Xen from 3.2.1 to 3.3, and the problem remains, which 
means I have changed:
1) Change domU kernel (2.6.21, 2.6.24, 2.6.25)
2) Change domU userland (gentoo, ubuntu)
3) Change dom0 physical nic + driver (Realtek 8169 -> 8168)
4) Change Xen version (3.2.1 -> 3.3)

The only thing I haven't changed is the dom0 kernel. I am using a stock 
2.6.21-xen gentoo kernel, so it would be great if anyone watching this 
that has pv domUs working under a 2.6.21 kernel would post their .config 
so I can compare it to mine.
Thanks,

Paul

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