RE: [Xen-users] decreasing Xenmon overhead

["Petersson, Mats" <Mats.Petersson@xxxxxxx>]

> -----Original Message-----
> From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx 
> [mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of 
> Ashish Gupta
> Sent: 29 May 2007 20:54
> To: Xen-users@xxxxxxxxxxxxxxxxxxx
> Subject: [Xen-users] decreasing Xenmon overhead
> 
> Hi,
> 
> I have been trying to run xenmon in its logging mode to 
> collect statistics for offline analysis. However  I notice 
> that at an interval of 100 ms or so the overhead imposed by 
> dom0 is quite high , with upto 40% of CPU utilization.

Yes, simply don't use 100ms inervals?

> 
> Are there ways I can drastically reduce this overhead ? I 
> read somwhere about event overhead, using event masks and 
> python overhead,  but am not really sure how to use this 
> information to reduce the overhead. 

Perhaps write a C-program rather than using Python to fetch/format the
information? That shouls improve it, but I guess you'll still see a
noticable overhead if you sample the information every 100ms. 

I'm not sure it's that meaningfull to run it that frequently, really. 

--
Mats
> 
> Any help is greatly appreciated !
> 
> thanks,
> Ashish
> 
> 
> 
> 



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