[Xen-devel] Working around xenstored performance?

[Pim van Riezen <pi+lists@xxxxxxxxxxxx>]

Good Day,

For monitoring purposes, we have a process that sends a 'xend.domains'  
methodCall to xend at timed intervals. Our problem here is that this  
call, if the extra parameter is not '0', is pretty slow; xenstored  
will run with 40% cpu grinding over its database before coming up with  
a reply, hardly something you want to do like every 15 seconds. With  
the parameter on 0, the response is instantaneous, but lacks any  
information beyond the list of currently running guests.
Is there a less intrusive way to just get the cpu-counter for a  
specific guest through /proc/xen or some such? I'd also be perfectly  
happy to fish the information out of xenstored's tdb-file, but all of  
its records seem to be in an undocumented binary encoding so that's  
not really helping either.
Our set-up is the Fedora branch of 3.0 (but from what I can read, 3.1  
still has this problem).
Cheers,
Pim van Riezen


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