[Bloat] [Cerowrt-devel] better business bufferbloat monitoring tools?

[Rick Jones]

On 05/12/2015 04:13 PM, Steinar H. Gunderson wrote:
> On Tue, May 12, 2015 at 03:17:34PM -0700, David Lang wrote:
>> I always set my graphs for 1 min samples (and am very tempted to go shorter)
>> just because 5 min hides so much.
>
> Just be aware that there are many devices (in particular switches) that only
> update SNMP counters now and then (say, every 17th second or whatever).[1]
> The shorter your polling interval, the greater your noise will be from that
> effect.
>
> [1] This used to be especially great in combination with devices that were too
> stupid to have 64-bit SNMP counters, but were fast enough to have 32-bit
> counters wraparound in 35 seconds or less.

If you want to get more extreme, even sFlow can have troubles (or at 
least could):

ftp://ftp.netperf.org/papers/high_freq_sflow/hf_sflow_counters.html

Of course, not everyone is chasing after the grail of stats every second :)

rick jones