[LARTC] Counters / measurement

[LARTC] Counters / measurement

[Michael T. Babcock]

Are the counters shown by, for example, tc -s qdisc accurate (w.r.t. 
time) and/or useful for measuring the effects of the QoS/TC options 
currently set?  I'm setting up some RRDTool data collection routines in 
Perl to graph the effects of our QoS & TC decisions but I'm not sure if 
grabbing 'bytes' & 'borrowed' from the qdiscs (where applicable) is 
sufficient or will actually reflect what is happening on the wire.

The other option I considered was to use fwmark filters only and have 
the same detection rules on both prerouting and outgoing tables to 
measure how many packets 'wanted' to go out and how many got out at any 
point in time.

Thank you for your thoughts and time.

PS, big thanks to Stef Coene for his website with all of its tools, 
including monitor.pl.  Since someone will end up asking, its at
http://users.belgacom.net/staf/
-- 
Michael T. Babcock
http://www.fibrespeed.net/~mbabcock/

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Re: [LARTC] Counters / measurement

[Michael T. Babcock]

On Wed, Nov 28, 2001 at 09:46:27PM +0100, Stef Coene wrote:
> So, Alexandre, forget my previous mail, unless you are interested of course.  
> And Michael, let's do are best to create some great progs that everyone can 
> use.

Assuming you haven't modified that script (perl) any, I've got a new 
version now that reads an array of handles and rrd name pairs to do the 
updates with.

Now it just needs something along the lines of a "make install" that 
creates the RRD database files if they don't exist and a README.  
Creating that PHP program automatically would probably be smart too ... 
;-)
-- 
Michael T. Babcock
CTO, FibreSpeed Ltd.

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