10G switch drops traffic for a split second

Wed Nov 30 16:58:06 UTC 2016

On 11/30/16, Mikael Abrahamsson <swmike at 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