Re: Bug in Xen 4.1.0: Xen leaks tapdisk2 processes

[Jim Fehlig <jfehlig@novell.com>]

Ian Campbell wrote:
> On Tue, 2011-05-03 at 18:18 +0100, Nathan March wrote:
>   
>> On 5/3/2011 8:56 AM, Ian Campbell wrote:
>>     
>>> On Fri, 2011-04-29 at 20:39 +0100, Nathan March wrote:
>>>       
>>>>>>> in Xen 4.1.0 using "tap2:aio:/dev/sdaX" Xen leaks tapdisk2 processes.
>>>>>>> After running some VMs and terminating them, only dom0 running, "ps
>>>>>>> aux" shows:
>>>>>>>               
>>>>> I can definitely confirm this, on a machine with 2 active VMs:
>>>>>           
>>> I'm assuming this is xl specific and that xend isn't behaving this way
>>> too, is that correct?
>>>       
>> That's a good question, I'm not really sure. I'm doing all the vm
>> creation/migration/shutdown using libvirt 0.9.0 rc1 and just connecting
>> with xen:/// to the local xend.  I thought xl was just a userspace
>> replacement for xm and the backend functionality was the same?
>>     

libvirt 0.9.0 was released.  In fact, 0.9.1 is now out.

>
> xl is a complete standalone toolstack, including the backend
> functionality.
>
>   
>> I don't have a spare server to test the patch with at the moment, but I
>> can try this out later this week.
>>     
>
> If you are running xm/xend rather than xl then it won't help.
>
> But I'm not sure how one tells with libvrit which you are running, I'd
> expect that if xend were running it would be used by default. Jim?
>   

If xend is running, libvirt will use it.  If not, it will attempt to use
libxenlight.  'virsh version' will tell which xen backend you are using.

E.g. if xend is running:
xen33: # virsh version
Compiled against library: libvir 0.9.0
Using library: libvir 0.9.0
Using API: Xen 3.0.1

If xend is not running:
xen33: # virsh version
Compiled against library: libvir 0.9.0
Using library: libvir 0.9.0
Using API: xenlight 0.9.0

Looks like I need to put libxenlight's version in there instead of
libvirt's version, but 'Xen' vs. 'xenlight' will tell which libvirt
backend is being used.

Regards,
Jim