[192871] in North American Network Operators' Group
Re: 10G switch drops traffic for a split second
daemon@ATHENA.MIT.EDU (Lee)
Wed Nov 30 11:58:11 2016
X-Original-To: nanog@nanog.org
In-Reply-To: <alpine.DEB.2.02.1611301742020.3558@uplift.swm.pp.se>
From: Lee <ler762@gmail.com>
Date: Wed, 30 Nov 2016 11:58:06 -0500
To: nanog@nanog.org
Errors-To: nanog-bounces@nanog.org
On 11/30/16, Mikael Abrahamsson <swmike@swm.pp.se> wrote:
> On Tue, 29 Nov 2016, TJ Trout wrote:
>
>> Is it possible to over run the buffers of a 320gbps backplane switch
>> with only 1.5gbps traffic? I think the switch is rated for 140m PPS and
>> I'm only pushing 100k PPS
>
> If your switch is the typical small-buffered-switch that has become more
> and more common the past few years, then the entire switch might have
> buffer to keep packets for 0.1ms or less. So if someone says "flow control
> off" for 0.1ms, depending on the implementation, you might then start
> seeing packet drops on all ports until that device turns flow control
> back on.
I always disabled flow control on the theory that VoIP & flow control
are incompatible.
just out of curiosity - anyone have it enabled? if so, why?
Lee
