xen-netfront: txqueues in a frozen state, no packets in the softqueue

xen-netfront: txqueues in a frozen state, no packets in the softqueue

[Stefano Stabellini]

Forwarding this email to xen-devel with a proper subject.


---------- Forwarded message ----------
Stefano,

   after a few days running traffic, we are seeing that one of the
linux netdevice txqueues has gone into a frozen state and any packet
that you give from there onwards is always queued to a softqueue and
is never put into the xen-netfront txqueue...

it also looks like xen-netfront is not registering a timeout callback
and this may lead to a crash if the callback ever gets invoked.

do you happen to know if this has been seen before and if there was a
fix for it?

we are currently running with linux-3.0.9.

Thank you!
-Alessandro-

Re: xen-netfront: txqueues in a frozen state, no packets in the softqueue

[Andrew Cooper]

XenServer had an issue which looked a little like this.

The fix was
http://xenbits.xensource.com/hg/xen-unstable.hg/rev/02b92d035f64 , but
if you are using PV guests then this is certainly not the same issue.

~Andrew

On 17/02/12 11:41, Stefano Stabellini wrote:
> Forwarding this email to xen-devel with a proper subject.
>
>
> ---------- Forwarded message ----------
> Stefano,
>
>    after a few days running traffic, we are seeing that one of the
> linux netdevice txqueues has gone into a frozen state and any packet
> that you give from there onwards is always queued to a softqueue and
> is never put into the xen-netfront txqueue...
>
> it also looks like xen-netfront is not registering a timeout callback
> and this may lead to a crash if the callback ever gets invoked.
>
> do you happen to know if this has been seen before and if there was a
> fix for it?
>
> we are currently running with linux-3.0.9.
>
> Thank you!
> -Alessandro-
>
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@lists.xensource.com
> http://lists.xensource.com/xen-devel

-- 
Andrew Cooper - Dom0 Kernel Engineer, Citrix XenServer
T: +44 (0)1223 225 900, http://www.citrix.com

Re: xen-netfront: txqueues in a frozen state, no packets in the softqueue

[Alessandro Salvatori]

we are using PV networking (and disk for what matters).

thanks!
-Alessandro-
 Here i am, A young man,
 A crashing computer program,
 Here is a pen, write out my name...

(from: The Servant - Orchestra)

On Fri, Feb 17, 2012 at 03:44, Andrew Cooper <andrew.cooper3@citrix.com> wrote:
> XenServer had an issue which looked a little like this.
>
> The fix was
> http://xenbits.xensource.com/hg/xen-unstable.hg/rev/02b92d035f64 , but
> if you are using PV guests then this is certainly not the same issue.
>
> ~Andrew
>
> On 17/02/12 11:41, Stefano Stabellini wrote:
>> Forwarding this email to xen-devel with a proper subject.
>>
>>
>> ---------- Forwarded message ----------
>> Stefano,
>>
>>    after a few days running traffic, we are seeing that one of the
>> linux netdevice txqueues has gone into a frozen state and any packet
>> that you give from there onwards is always queued to a softqueue and
>> is never put into the xen-netfront txqueue...
>>
>> it also looks like xen-netfront is not registering a timeout callback
>> and this may lead to a crash if the callback ever gets invoked.
>>
>> do you happen to know if this has been seen before and if there was a
>> fix for it?
>>
>> we are currently running with linux-3.0.9.
>>
>> Thank you!
>> -Alessandro-
>>
>> _______________________________________________
>> Xen-devel mailing list
>> Xen-devel@lists.xensource.com
>> http://lists.xensource.com/xen-devel
>
> --
> Andrew Cooper - Dom0 Kernel Engineer, Citrix XenServer
> T: +44 (0)1223 225 900, http://www.citrix.com
>

Re: xen-netfront: txqueues in a frozen state, no packets in the softqueue

[Alessandro Salvatori]

maybe i replied too quickly and impulsively.

On Fri, Feb 17, 2012 at 12:15, Alessandro Salvatori <sandr8@gmail.com> wrote:
> we are using PV networking (and disk for what matters).

we are using PV networking (and disk for what matters), *on HVM* (PV/HVM).

thanks!
-Alessandro-
 Here i am, A young man,
 A crashing computer program,
 Here is a pen, write out my name...

(from: The Servant - Orchestra)



On Fri, Feb 17, 2012 at 12:15, Alessandro Salvatori <sandr8@gmail.com> wrote:
> we are using PV networking (and disk for what matters).
>
> thanks!
> -Alessandro-
>  Here i am, A young man,
>  A crashing computer program,
>  Here is a pen, write out my name...
>
> (from: The Servant - Orchestra)
>
> On Fri, Feb 17, 2012 at 03:44, Andrew Cooper <andrew.cooper3@citrix.com> wrote:
>> XenServer had an issue which looked a little like this.
>>
>> The fix was
>> http://xenbits.xensource.com/hg/xen-unstable.hg/rev/02b92d035f64 , but
>> if you are using PV guests then this is certainly not the same issue.
>>
>> ~Andrew
>>
>> On 17/02/12 11:41, Stefano Stabellini wrote:
>>> Forwarding this email to xen-devel with a proper subject.
>>>
>>>
>>> ---------- Forwarded message ----------
>>> Stefano,
>>>
>>>    after a few days running traffic, we are seeing that one of the
>>> linux netdevice txqueues has gone into a frozen state and any packet
>>> that you give from there onwards is always queued to a softqueue and
>>> is never put into the xen-netfront txqueue...
>>>
>>> it also looks like xen-netfront is not registering a timeout callback
>>> and this may lead to a crash if the callback ever gets invoked.
>>>
>>> do you happen to know if this has been seen before and if there was a
>>> fix for it?
>>>
>>> we are currently running with linux-3.0.9.
>>>
>>> Thank you!
>>> -Alessandro-
>>>
>>> _______________________________________________
>>> Xen-devel mailing list
>>> Xen-devel@lists.xensource.com
>>> http://lists.xensource.com/xen-devel
>>
>> --
>> Andrew Cooper - Dom0 Kernel Engineer, Citrix XenServer
>> T: +44 (0)1223 225 900, http://www.citrix.com
>>

Re: xen-netfront: txqueues in a frozen state, no packets in the softqueue

[Alessandro Salvatori]

Andrew,

  is there a hot patch available for Xenserver 6.0.0 that fixes this?
if not, when would it be available?

thank you!
-alessandro-

On Fri, Feb 17, 2012 at 12:17, Alessandro Salvatori <sandr8@gmail.com> wrote:
> maybe i replied too quickly and impulsively.
>
> On Fri, Feb 17, 2012 at 12:15, Alessandro Salvatori <sandr8@gmail.com> wrote:
>> we are using PV networking (and disk for what matters).
>
> we are using PV networking (and disk for what matters), *on HVM* (PV/HVM).
>
> thanks!
> -Alessandro-
>  Here i am, A young man,
>  A crashing computer program,
>  Here is a pen, write out my name...
>
> (from: The Servant - Orchestra)
>
>
>
> On Fri, Feb 17, 2012 at 12:15, Alessandro Salvatori <sandr8@gmail.com> wrote:
>> we are using PV networking (and disk for what matters).
>>
>> thanks!
>> -Alessandro-
>>  Here i am, A young man,
>>  A crashing computer program,
>>  Here is a pen, write out my name...
>>
>> (from: The Servant - Orchestra)
>>
>> On Fri, Feb 17, 2012 at 03:44, Andrew Cooper <andrew.cooper3@citrix.com> wrote:
>>> XenServer had an issue which looked a little like this.
>>>
>>> The fix was
>>> http://xenbits.xensource.com/hg/xen-unstable.hg/rev/02b92d035f64 , but
>>> if you are using PV guests then this is certainly not the same issue.
>>>
>>> ~Andrew
>>>
>>> On 17/02/12 11:41, Stefano Stabellini wrote:
>>>> Forwarding this email to xen-devel with a proper subject.
>>>>
>>>>
>>>> ---------- Forwarded message ----------
>>>> Stefano,
>>>>
>>>>    after a few days running traffic, we are seeing that one of the
>>>> linux netdevice txqueues has gone into a frozen state and any packet
>>>> that you give from there onwards is always queued to a softqueue and
>>>> is never put into the xen-netfront txqueue...
>>>>
>>>> it also looks like xen-netfront is not registering a timeout callback
>>>> and this may lead to a crash if the callback ever gets invoked.
>>>>
>>>> do you happen to know if this has been seen before and if there was a
>>>> fix for it?
>>>>
>>>> we are currently running with linux-3.0.9.
>>>>
>>>> Thank you!
>>>> -Alessandro-
>>>>
>>>> _______________________________________________
>>>> Xen-devel mailing list
>>>> Xen-devel@lists.xensource.com
>>>> http://lists.xensource.com/xen-devel
>>>
>>> --
>>> Andrew Cooper - Dom0 Kernel Engineer, Citrix XenServer
>>> T: +44 (0)1223 225 900, http://www.citrix.com
>>>