Re: [MirageOS-devel] Monitoring MirageOS guests on CubieBoard2

[Dave Scott <Dave.Scott@xxxxxxxxxx>]

On 14 May 2014, at 17:21, Anil Madhavapeddy <anil@xxxxxxxxxx> wrote:

> On 14 May 2014, at 17:15, Jon Ludlam <jjl25@xxxxxxxxx> wrote:
> 
>> On 14/05/14 16:55, Anil Madhavapeddy wrote:
>>> On 14 May 2014, at 16:47, Jon Ludlam <jjl25@xxxxxxxxx> wrote:
>>>>> On 14/05/14 15:06, Anil Madhavapeddy wrote:
>>>>>> On 14 May 2014, at 14:01, buzz heavyyear <buzzheavyyear@xxxxxxxxxxx> 
>>>>>> wrote:
>>>>>> 
>>>>>> Now that I'm having a lot of fun getting up to speed with ocaml, xen, 
>>>>>> mirage, writing ocaml guests and getting them to run on the Cubieboard, 
>>>>>> what I really need is to see how they are performing as they are running.
>>>>>> 
>>>>>> XAPI/XCP has rrd. Am I right in thinking that a good way forward is to 
>>>>>> includegithub.com/xapi-project/xcp-rrd during the build process?
>>>>>> 
>>>>>> Perhaps there's an easier way? Any thoughts anyone?
>>>>> RRD is definitely the right direction for dom0 to track guest activity, 
>>>>> but we do need to get vchan up to speed from the guest side.  Dave, Jon, 
>>>>> what's the current state of ocaml-vchan?  I'm happy to add a Cohttp 
>>>>> functor for it if there's something vaguely resembling a FLOW interface 
>>>>> (right now, it's fairly low level).
>>>> I believe the state is 'I saw it work once recently'. There's nothing
>>>> really resembling a flow interface, but I'm sure one could be assembled
>>>> fairly easily.
>>> Thanks, is there a working unit test domain anywhere?  If we're going to 
>>> depend on vchan, it's time to get the low level bits well tested. The 
>>> atomic bit ops particularly worrisome, and we are likely to be the first 
>>> ARM vchan user (so let's get the x86 bugs sorted first :-)
>>> 
>>> Anil
>>> 
>>> 
>> What I was using to test was the vchan client from the xen repository.
>> I'll have another look at it tomorrow if you like?
> 
> Ah yes, I keep forgetting about those binaries from the Xen repo -- are they 
> installed by distros these days? (so we have a netcat-like vchan client).

Good question. I need to take a look at vchan again, to see if it makes sense 
to plumb a vchan link through to guests from the dom0 toolstack for off-box 
cloud orchestration layers to talk to their service VMs without using ssh. 
Perhaps little Mirage HTTP <-> vchan service would work nicely.

Cheers,
Dave
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