[Xen-users] Re: XenMon question

[Rob Gardner <rob.gardner@xxxxxx>]

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

Rob Gardner



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