[rbranson]

The (undocumented) PPS limitation on EC2 instance types before they added SR-IOV NICs is around 150K PPS. If you had your own full machine — usually the top size of a given instance class, but no guarantee — this would be pretty consistent. But it was a shared resource. This made running memcache clusters really painful on EC2, given that they’d easily get limited by packet throughput before CPU or bandwidth. With modern instance types it’s much better!

[ra1n85]

????

Where are you getting these numbers? For what instance types? For what protocols? This is just wrong.

[edoceo]

GP said it was undocumented (I presume empirical, but would like more details)

Do you have a more accurate dataset? What are your observations?

I'm assuming this affects loads of HN readers and I too am interested in what the facts are.

Side note: you may be getting downvoted because a source, or other details are lacking. I too get downvoted for posts that lack these details.

[samstave]

I took him saying "just wrong" as being "im not OK with this", but i could be incorrect.

However, with that said, i have always found that calling your rep and asking about specific un documented limits is the fastest way to get to the bottom of per-instance/account/vpc/whatever limits.

Just as there are limits that can be changed if you agree, in writing, that you will be financially responsible for whatever the impact is (e.g. when you could tell them that you wanted spot price limits adjusted for you to be able to better bid above the scaling factors that were in place(not sure if this is still the case))

Some limits are global and cant be changed/negotiated, but other undocumented limits....