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xen-users
[Xen-users] Re: XenMon question
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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