[BUG] 16 vcpus + 2 vif bridge = issue ?

[BUG] 16 vcpus + 2 vif bridge = issue ?

[Roman Shubovich]

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hi

i have physical server with 40 cpu cores
and i need to create a hvm domu with at least 16 vcpus and 2 network bridges
when i start that domu i have some not understable issue - the second
bridge has no traffic from network (works only first interface - first
declared in config file). i can see traffic with tcpdum on dom0, but not on
vif interface that has been created by domu startup script.

when i reduce number of vcpu to 15 or less then bridges works fine

system:
dom0 ubuntu 14.04.03 kernel 3.18.21
domu ubuntu 14.04.03 kernel 3.18.21
tried xen:
xen 4.4
xen 4.5
xen 4.6

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Re: [BUG] 16 vcpus + 2 vif bridge = issue ?

[Ian Campbell]

On Thu, 2015-09-24 at 03:16 +0300, Roman Shubovich wrote:
> hi
> 
> i have physical server with 40 cpu cores
> and i need to create a hvm domu with at least 16 vcpus and 2 network
> bridges
> when i start that domu i have some not understable issue - the second
> bridge has no traffic from network (works only first interface - first
> declared in config file). i can see traffic with tcpdum on dom0, but not
> on vif interface that has been created by domu startup script.
> 
> when i reduce number of vcpu to 15 or less then bridges works fine

Please post some logs:

 * dmesg of both host and guest
 * output of these commands in dom0 while the guest is running with 2 vifs
   configured (but only one working):
    * "brctl show"
    * "ifconfig -a"
 * The output of "ifconfig -a" within the guest in the same configuration.
 * The guest configuration file you are using.

Thanks.
Ian.

> 
> system:
> dom0 ubuntu 14.04.03 kernel 3.18.21
> domu ubuntu 14.04.03 kernel 3.18.21
> tried xen:
> xen 4.4
> xen 4.5
> xen 4.6
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@lists.xen.org
> http://lists.xen.org/xen-devel

Re: [BUG] 16 vcpus + 2 vif bridge = issue ?

[Ian Campbell]

On Thu, 2015-09-24 at 09:56 +0100, Ian Campbell wrote:
> On Thu, 2015-09-24 at 03:16 +0300, Roman Shubovich wrote:
> > hi
> > 
> > i have physical server with 40 cpu cores
> > and i need to create a hvm domu with at least 16 vcpus and 2 network
> > bridges
> > when i start that domu i have some not understable issue - the second
> > bridge has no traffic from network (works only first interface - first
> > declared in config file). i can see traffic with tcpdum on dom0, but
> > not
> > on vif interface that has been created by domu startup script.
> > 
> > when i reduce number of vcpu to 15 or less then bridges works fine
> 
> Please post some logs:

Also I didn't notice this went to xen-devel@, which is a list for
_development_ of Xen. User support and configuration issues belong on xen
-users@.

If I had noticed this I would have added -users to the CC and moved -devel
to BCC in my previous reply. If you see this before you reply to my
previous mail please adjust the Cc's appropriately, otherwise please try
and remember to use the appropriate list next time.

Thanks,
Ian.

>  * dmesg of both host and guest
>  * output of these commands in dom0 while the guest is running with 2
> vifs
>    configured (but only one working):
>     * "brctl show"
>     * "ifconfig -a"
>  * The output of "ifconfig -a" within the guest in the same
> configuration.
>  * The guest configuration file you are using.
> 
> Thanks.
> Ian.
> 
> > 
> > system:
> > dom0 ubuntu 14.04.03 kernel 3.18.21
> > domu ubuntu 14.04.03 kernel 3.18.21
> > tried xen:
> > xen 4.4
> > xen 4.5
> > xen 4.6
> > _______________________________________________
> > Xen-devel mailing list
> > Xen-devel@lists.xen.org
> > http://lists.xen.org/xen-devel
> 
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@lists.xen.org
> http://lists.xen.org/xen-devel