[libvirt] [PATCHV2] qemu: Add support for changing timeout value to open unix monitor socket

[Cole Robinson]

On 01/07/2014 05:39 AM, Richard W.M. Jones wrote:
> On Tue, Jan 07, 2014 at 11:37:11AM +0100, Martin Kletzander wrote:
>> On Tue, Jan 07, 2014 at 10:28:41AM +0000, Richard W.M. Jones wrote:
>>> On Thu, Jan 02, 2014 at 06:29:35PM +0200, Pavel Fux wrote:
>>>> Adding an option to change monitor socket opening timeout
>>>> the current default is 3 seconds and in some cases it's not enough
>>>
>>> This should change the *default* to something way bigger than 3
>>> seconds, since lots of people are hitting this.  Just look at the
>>> dozen Ubuntu forum posts and many other bug reports:
>>>
>>> https://www.google.co.uk/search?q="monitor+socket+did+not+show+up"
>>>
>>> Sure it can be configurable if you want, but I don't want to have to
>>> tell each and every libguestfs user that they should change this to
>>> something sensible.  Make the default something much larger.
>>>
>>
>> I agree with you here, we could change it to at least 5 seconds *and*
>> make it configurable.  I'll propose the change of the default in
>> separate patch and try reviewing this ASAP.
> 
> Is there a reason not to make it 30 seconds?
> 
> The only downside I can see is that if qemu is really hanging/broken
> users will have to wait 30 seconds to see that it is hanging, versus
> waiting 3 or 5 seconds.  I can't see that is much of a drawback.
> 

I agree that bumping the timeout to 30 seconds should be fine: qemu actually
hanging before the monitor socket is setup is something I never hear about, so
the large timeout shouldn't matter much in practice. So ACK to raising it to 30.

- Cole