Re: [Xen-devel] [Xen-users] Xen bridging issue.

[Wei Liu <wei.liu2@xxxxxxxxxx>]

On Tue, Sep 08, 2015 at 02:33:53PM +0300, johnny Strom wrote:
> On 09/08/2015 02:12 PM, Wei Liu wrote:
> >On Tue, Sep 08, 2015 at 02:07:21PM +0300, johnny Strom wrote:
> >>On 09/08/2015 01:06 PM, Wei Liu wrote:
> >>>On Tue, Sep 08, 2015 at 12:59:39PM +0300, johnny Strom wrote:
> >>>>On 09/08/2015 12:13 PM, Wei Liu wrote:
> >>>>>  xenstore-ls/local/domain/$DOMID/
> >>>>Here is the output of xenstore-ls only one network card is working.
> >>>>
> >>>>xenstore-ls  /local/domain/1
> >>>>
> >>>[...]
> >>>>  vif = ""
> >>>>   0 = ""
> >>>>    backend = "/local/domain/0/backend/vif/1/0"
> >>>>    backend-id = "0"
> >>>>    state = "4"
> >>>>    handle = "0"
> >>>>    mac = "00:16:3e:ee:aa:aa"
> >>>>    multi-queue-num-queues = "17"
> >>>OK so the number of queues is 17. You probably don't need that many
> >>>queues.
> >>>
> >>>Set module parameter "xenvif_max_queues" of netback to something like 4
> >>>should work around the problem for you.
> >>Hello
> >>
> >>I tried to set it to 4 in  /etc/modprobe.d/xen_netback.conf
> >>
> >>rmmod xen_netback
> >>
> >>modprobe -v xen_netback
> >>insmod
> >>/lib/modules/3.16.0-4-amd64/kernel/drivers/net/xen-netback/xen-netback.ko
> >>xenvif_max_queues=4
> >>
> >>
> >>
> >>But it is still the same issue..
> >>
> >>Is xenvif_max_queues supported in Linux kernel 3.16?
> >>
> >>modinfo -p xen_netback
> >>
> >>separate_tx_rx_irq: (bool)
> >>rx_drain_timeout_msecs: (uint)
> >>rx_stall_timeout_msecs: (uint)
> >>max_queues:Maximum number of queues per virtual interface (uint)
> >Oh, right, the parameter name should be "max_queues".
> >
> >Sorry about that!
> >
> >Wei.
> 
> 
> It's still the same issue:
> 
> modprobe -v xen_netback
> insmod
> /lib/modules/3.16.0-4-amd64/kernel/drivers/net/xen-netback/xen-netback.ko
> max_queues=4
> 

If there are the precise steps you took, isn't modprobe -v already
inserted the module without parameter set? I.e. the later insmod had no
effect.

> 
> But what could be reason for this?
> 

Make sure that parameter is correctly set. You can look at
/sys/module/xen_netback/parameter/max_queues for the actual number.

You can even just echo a number to that file to set the value on the
fly.

> Could it be problems with one of the CPUS? since if I boot dom0 with just 14
> cpu cores then it works....
> 

No, it can't be related to CPUs.  That's because DomU doesn't exhaust
resources anymore.

Wei.

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