From: Rick Jones <rick.jones2@hp.com>
To: bloat@lists.bufferbloat.net
Subject: Re: [Bloat] [Cerowrt-devel] better business bufferbloat monitoring tools?
Date: Tue, 12 May 2015 16:46:31 -0700 [thread overview]
Message-ID: <555290D7.7040508@hp.com> (raw)
In-Reply-To: <20150512231330.GA30054@sesse.net>
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
next prev parent reply other threads:[~2015-05-12 23:46 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-05-12 16:00 [Bloat] " Dave Taht
2015-05-12 22:17 ` [Bloat] [Cerowrt-devel] " David Lang
2015-05-12 23:13 ` Steinar H. Gunderson
2015-05-12 23:46 ` Rick Jones [this message]
2015-05-13 13:20 ` [Bloat] " Bill Ver Steeg (versteb)
2015-05-13 13:36 ` Dave Taht
2015-05-13 17:51 ` Bill Ver Steeg (versteb)
2015-05-14 15:40 ` [Bloat] RE : " luca.muscariello
2015-05-13 15:30 ` [Bloat] [Cerowrt-devel] " Jim Gettys
2015-05-14 14:28 ` dpreed
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