Re: Disabling mergeable rx buffers for the guest

[Paolo Bonzini <pbonzini@redhat.com>]

Il 16/07/2013 12:40, Naor Shlomo ha scritto:
> Hi Paolo,
> 
> For some unknown reason it suddenly started to accept the changes to the XML and the strings you gave me are now in place.

Good.

> Upon machine start I now receive the following error messages:
> 
> virsh # start NaorDev
> error: Failed to start domain NaorDev
> error: internal error Process exited while reading console log output: kvm: -global: requires an argument"
> 

That's because I cut-and-pasted without reading:

>   <qemu:commandline>
>     <qemu:arg value='-global'/>
>     <qemu:env name='mrg_rxbuf' value='off'/>
>   </qemu:commandline>

The right one is (or at this point I'd better say "should be"):

   <qemu:commandline>
     <qemu:arg value='-global'/>
     <qemu:arg value='virtio-net-pci.mrg_rxbuf=off'/>
   </qemu:commandline>

Paolo

> </domain>
> 
> Naor
> 
> -----Original Message-----
> From: Paolo Bonzini [mailto:pbonzini@redhat.com] 
> Sent: Tuesday, July 16, 2013 12:36 PM
> To: Naor Shlomo
> Cc: kvm@vger.kernel.org
> Subject: Re: Disabling mergeable rx buffers for the guest
> 
> Il 16/07/2013 10:06, Naor Shlomo ha scritto:
>> Thanks again Paolo,
>>
>> I used your string and read the documents in the site you referred me to but could not understand why doesn't it accept the xmlns:qemu='http://libvirt.org/schemas/domain/qemu/1.0' string.
>>
>> I tried it on the following version:
>> Compiled against library: libvir 0.9.8 Using library: libvir 0.9.8 
>> Using API: QEMU 0.9.8 Running hypervisor: QEMU 1.0.0
>>
>> So according to the site it should be supported.
>>
>> Any idea what am I missing now?
> 
> Not sure.  Can you post here the full XML, and the one you're trying to use?
> 
> Paolo
> 
>> Naor
>>
>> -----Original Message-----
>> From: Paolo Bonzini [mailto:pbonzini@redhat.com]
>> Sent: Tuesday, July 16, 2013 9:42 AM
>> To: Naor Shlomo
>> Cc: kvm@vger.kernel.org
>> Subject: Re: Disabling mergeable rx buffers for the guest
>>
>> Il 16/07/2013 08:40, Naor Shlomo ha scritto:
>>> Hi Paolo and thanks for your quick reply,
>>>
>>> I tried editing (virsh edit) the domain's XML and put the XML excerpt you gave me everywhere but with no success.
>>> The moment I exit the edit mode the text was gone (I guess it didn't pass some sort of sanity and that's why it was automatically erased).
>>>
>>> What am I doing wrong?
>>
>> My fault.  You need to change the <domain> opening tag to
>>
>> <domain type='qemu' 
>> xmlns:qemu='http://libvirt.org/schemas/domain/qemu/1.0'>
>>
>> See http://libvirt.org/drvqemu.html#qemucommand for the docs.
>>
>> Paolo
>>
>