netback: Carrier off / Carrier on again, rinse, repeat

netback: Carrier off / Carrier on again, rinse, repeat

[Christopher S. Aker]

Xen: 4.4.2-pre (28573:f6f6236af933) + xsa111, xsa112, xsa114
Dom0: 3.17.4

We recently moved our dom0 from 3.10.x to 3.17.4, in order to avoid a netback host crash that has been plaguing us.  After doing so, the new multi-queue netback stuff constantly on/offs carrier on the vif, spamming the console, and making the bridge device leave forwarding state and then immediately reenter forwarding state.

vif vif-43-0 vif43.0: Carrier off due to lack of guest response on queue 0
br0: port 44(vif43.0) entered disabled state
vif vif-43-0 vif43.0: Carrier on again
br0: port 44(vif43.0) entered forwarding state
br0: port 44(vif43.0) entered forwarding state
br0: port 44(vif43.0) entered forwarding state
vif vif-43-0 vif43.0: Carrier off due to lack of guest response on queue 0
br0: port 44(vif43.0) entered disabled state
vif vif-43-0 vif43.0: Carrier on again
br0: port 44(vif43.0) entered forwarding state
br0: port 44(vif43.0) entered forwarding state
br0: port 44(vif43.0) entered forwarding state
vif vif-113-0 vif113.0: Carrier off due to lack of guest response on queue 0
br0: port 108(vif113.0) entered disabled state
vif vif-113-0 vif113.0: Carrier on again
br0: port 108(vif113.0) entered forwarding state
br0: port 108(vif113.0) entered forwarding state
br0: port 108(vif113.0) entered forwarding state
vif vif-43-0 vif43.0: Carrier off due to lack of guest response on queue 0
br0: port 44(vif43.0) entered disabled state
vif vif-43-0 vif43.0: Carrier on again
br0: port 44(vif43.0) entered forwarding state
br0: port 44(vif43.0) entered forwarding state
br0: port 44(vif43.0) entered forwarding state
vif vif-43-0 vif43.0: Carrier off due to lack of guest response on queue 0
br0: port 44(vif43.0) entered disabled state
vif vif-43-0 vif43.0: Carrier on again
br0: port 44(vif43.0) entered forwarding state
br0: port 44(vif43.0) entered forwarding state
br0: port 44(vif43.0) entered forwarding state

(This is in the span of a few minutes, however it is non-stop)

If this is normal expected operation then obviously we can live with the console messages, but - I just wanted to report this in the case it is not expected behavior.

Thanks,
-Chris

Re: netback: Carrier off / Carrier on again, rinse, repeat

[Zoltan Kiss]

Hi,

This has been fixed by "f48da8: xen-netback: fix unlimited guest Rx 
internal queue and carrier flapping", it's already in 3.18, I don't know 
if it is going to be backported to 3.17

Zoli

On 11/12/14 14:42, Christopher S. Aker wrote:
> Xen: 4.4.2-pre (28573:f6f6236af933) + xsa111, xsa112, xsa114
> Dom0: 3.17.4
>
> We recently moved our dom0 from 3.10.x to 3.17.4, in order to avoid a netback host crash that has been plaguing us.  After doing so, the new multi-queue netback stuff constantly on/offs carrier on the vif, spamming the console, and making the bridge device leave forwarding state and then immediately reenter forwarding state.
>
> vif vif-43-0 vif43.0: Carrier off due to lack of guest response on queue 0
> br0: port 44(vif43.0) entered disabled state
> vif vif-43-0 vif43.0: Carrier on again
> br0: port 44(vif43.0) entered forwarding state
> br0: port 44(vif43.0) entered forwarding state
> br0: port 44(vif43.0) entered forwarding state
> vif vif-43-0 vif43.0: Carrier off due to lack of guest response on queue 0
> br0: port 44(vif43.0) entered disabled state
> vif vif-43-0 vif43.0: Carrier on again
> br0: port 44(vif43.0) entered forwarding state
> br0: port 44(vif43.0) entered forwarding state
> br0: port 44(vif43.0) entered forwarding state
> vif vif-113-0 vif113.0: Carrier off due to lack of guest response on queue 0
> br0: port 108(vif113.0) entered disabled state
> vif vif-113-0 vif113.0: Carrier on again
> br0: port 108(vif113.0) entered forwarding state
> br0: port 108(vif113.0) entered forwarding state
> br0: port 108(vif113.0) entered forwarding state
> vif vif-43-0 vif43.0: Carrier off due to lack of guest response on queue 0
> br0: port 44(vif43.0) entered disabled state
> vif vif-43-0 vif43.0: Carrier on again
> br0: port 44(vif43.0) entered forwarding state
> br0: port 44(vif43.0) entered forwarding state
> br0: port 44(vif43.0) entered forwarding state
> vif vif-43-0 vif43.0: Carrier off due to lack of guest response on queue 0
> br0: port 44(vif43.0) entered disabled state
> vif vif-43-0 vif43.0: Carrier on again
> br0: port 44(vif43.0) entered forwarding state
> br0: port 44(vif43.0) entered forwarding state
> br0: port 44(vif43.0) entered forwarding state
>
> (This is in the span of a few minutes, however it is non-stop)
>
> If this is normal expected operation then obviously we can live with the console messages, but - I just wanted to report this in the case it is not expected behavior.
>
> Thanks,
> -Chris
>
>
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