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Comment by iknownothow | Hacker News Reader

Thanks for pointing that out, I never noticed that setting. I just tried to launch an EC2 instance looking for this setting and here's what I found.

> A credit specification is only available for T2, T3, and T3a instances. Selecting Unlimited for the credit specification allows applications to burst beyond the baseline for as long as needed at any time.

So that would mean Unlimited is not a setting available for T4g (ARM instance) and therefore may explain inconsistent behavior in the ARM instance.

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It's the same for t4g.

    > T4g instances start in unlimited mode by default, giving users the ability to sustain high CPU performance over any desired time frame while keeping cost as low as possible. For most general purpose workloads, T4g instances in unlimited mode provide ample performance without any additional charges. If the average CPU utilization of a T4g instance is lower than the baseline over a 24-hour period, the hourly instance price automatically covers all interim spikes in usage. In the cases when a T4g instance needs to run at higher CPU utilization for a prolonged period, it can do so for a small additional charge of $0.04 per vCPU-hour. In standard mode, a T4g instance can burst until it uses up all of its earned credits. For more details on T4g credits, please see the EC2 documentation page.

https://aws.amazon.com/ec2/instance-types/t4/

That note did not show up for me when launching the EC2 instance. Probably because I was switching between ARM and AMD quite a bit which caused the info pop ups to stop refreshing and not display info for T4g and were stuck on T2 and T3.

I don't recall ever seeing pop-ups for that. I've always handled that via the "advanced details" section when launching instances manually through the web console.

I've just launched a test t3 instance and it didn't pop up anything.

My bad, not pop ups, instead there's an info symbol next to each option under "advanced details". I was being lazy with the terminology, I don't know what such info buttons are called.

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