Re: [Xen-users] Re: XenMon question

[Tim Freeman <tfreeman@xxxxxxxxxxx>]

On Wed, 04 Jan 2006 10:57:09 -0700
Rob Gardner <rob.gardner@xxxxxx> wrote:

> Tim Freeman wrote:
> 
> >I wonder if any extra setup is needed to run XenMon for 3.0.0.  It looks like
> >the patch was applied into the hypervisor a while back and that the python
> >program xenmon.py starts xenbaked for you.  But when I run XenMon, it prints:
> >
> >
> ># python xenmon.py
> >xenbaked: no process killed
> >ms_per_sample = 100
> >Initialized with 2 cpu's
> >CPU Frequency = 1800.10
> >ERROR: Failure to get trace buffer pointer from Xen (22 = Invalid argument)
> >  
> >
> 
> 
> Tim,
> 
> There is an additional step needed to make xenmon work. I apologize for 
> not documenting this. Xen starts out running with trace buffers 
> disabled, and so the trace buffer size needs to be set and enabled 
> before xenmon will run.
> 
> In the tools/xentrace directory you will find two programs, setsize and 
> tbctl. Try the following:
>   setsize 10  
>   tbctl 1
> This will set the trace buffer size to 10 pages, which is a decent 
> default value, and the tbctl command will turn on tracing in the hypervisor.

Aha, it's working now. 

Thankyou, 
Tim 


> 
> I will make an addendum to the xenmon readme file with this information.
> 
> Rob Gardner
> 
> 
> 
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> 

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