Some datacenters enable Priority Flow Control (PFC) which is different in that it pauses only the traffic with a specific PCP ( Priority in 802.1Q vlan tag ). They assign storage traffic a specific vlan priority and treat it as lossless with flow control but the rest of the traffic is unaffected.
The mechanism here Pause is an abomination which should never be enabled.
> Some datacenters enable Priority Flow Control (PFC) which is different in that it pauses only the traffic with a specific PCP ( Priority in 802.1Q vlan tag ). They assign storage traffic a specific vlan priority and treat it as lossless with flow control but the rest of the traffic is unaffected.
I don't think he had his TV in a datacenter.
From the article:
> After some clever deductive reasoning, a.k.a randomly unplugging cables from the router, I determined that my TV was sending these mystery frames (yes, my TV — I have a Sony X805D Android TV).
> The mechanism here Pause is an abomination which should never be enabled.
What? You can't be serious, I think you have no idea what that would cause in almost every ethernet network. Let me tell you: a lot of packet loss that messes with TCP streams etc.
L2 pause frames are used by practically all of the ethernet devices, and for a really good reason. Pause frames are a perfectly good way to do flow control in most networks. Not having them means a lot of lost frames and generic pain in most networks... except of course datacenters.
Sure, it's not a standard. But it's good enough for 99.9% of use cases. Just maybe not in datacenter.
The mechanism here Pause is an abomination which should never be enabled.