Re: [hobbit] bandwidth usage in bytes on Linux

[Rich Smrcina <rsmrcina (at) wi.rr.com>]

My vote would be for the method that uses the least amount of resources 
(within reason).  If the data is available using existing interfaces and 
does not require additional software (like mrtg), it's goodness (as long 
as it's accurate).  I have no reason to think that ifconfig wouldn't be 
accurate.

A separate graph per interface works for me (that's the way the mrtg 
implementation does it).

The worst thing for a monitor to do is to become a performance problem.

Henrik Stoerner wrote:
> On Thu, Nov 10, 2005 at 06:46:49AM -0600, Rich Smrcina wrote:
>
> > Jesper Johnson wrote:
> >
> > > I'm looking for a way to create graphs for hobbit on Linux to monitor 
> > > network bandwidth usage, separately on each interface (eth0,eth1). The 
> >
> > There is a very well described MRTG interface for Hobbit.  I just 
> > implemented it at a customer site and it works as advertised.  The URL 
> > is in the help.
>
>
> MRTG would indeed solve this problem.
>
> But it might still make some sense to have the Linux hobbitclient 
> collect the data from /sbin/ifconfig. It does have byte counters:
>
> eth0      Link encap:Ethernet  HWaddr 00:0E:A6:CE:D6:85  
>           inet addr:172.16.10.100  Bcast:172.16.10.255  Mask:255.255.255.0
>           inet6 addr: fe80::20e:a6ff:fece:d685/64 Scope:Link
>           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
>           RX packets:7935102 errors:0 dropped:0 overruns:0 frame:0
>           TX packets:7943900 errors:0 dropped:0 overruns:0 carrier:0
>           collisions:0 txqueuelen:1000 
>           RX bytes:2210282597 (2.0 GiB)  TX bytes:2268014990 (2.1 GiB)
>           Interrupt:17 
>
> I dont think Hobbit should use these to populate the tcpOutDataBytes and
> tcpInInorderBytes fields in the netstat rrd - the ifconfig counters are
> per network interface, where the rest of the netstat data are global
> counters. 
>
> But perhaps there should be a completely separate set of RRD files, with 
> one graph per network interface ?
>
>
> Regards,
> Henrik
>
>
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Rich Smrcina
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