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colmmacc's profile
Colm MacCárthaigh
Colm MacCárthaigh
Colm MacCárthaigh
@colmmacc

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Colm MacCárthaigh

@colmmacc

AWS, Apache, Crypto, Irish Music, Haiku, Photography

Seattle
notesfromthesound.com
Joined April 2008

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    1. 𝕿𝖎𝖆𝖌𝖔 𝕱𝖆𝖗𝖎𝖆‏ @0xtf May 18
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      A 🧵on AWS and what I hope isn't a plan to screw partners: On the 7th of February AWS edited their documentation to include a limit on Traffic Mirror Sessions that wasn't, until then, ever mentioned.

      4 replies 2 retweets 10 likes
      Show this thread
    2. Colm MacCárthaigh‏ @colmmacc May 18
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      Replying to @0xtf

      The limits are a straightforward technical constraint. We're always working on improving things, but I'll try to explain how it works 'under the hood' for now.

      1 reply 1 retweet 8 likes
    3. Colm MacCárthaigh‏ @colmmacc May 18
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      Replying to @colmmacc @0xtf

      Anytime you have 'N' senders with X Gbit/sec each mirroring to a destination which also has X Gbit/sec, then obviously contention can occur. The senders may not be sending X Gbit/sec, but we have to plan for the possibility that they all max-out before backpressure can kick in.

      1 reply 0 retweets 3 likes
    4. Colm MacCárthaigh‏ @colmmacc May 18
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      Replying to @colmmacc @0xtf

      If we allowed contention at the network fabric or rack level, it would impact a lot of other customers. That's no good. That informs the sort of "base" safe limit.

      1 reply 0 retweets 1 like
    5. Colm MacCárthaigh‏ @colmmacc May 18
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      Replying to @colmmacc @0xtf

      There's also possibility for contention at the instance level; because of the physical NIC on the hardware. That's the other limit. We're able to raise that when you run on dedicated hardware because no other customer is impacted.

      1 reply 0 retweets 1 like
    6. Colm MacCárthaigh‏ @colmmacc May 18
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      Replying to @colmmacc @0xtf

      NLB runs on AWS Hyperplane, which can scale to Terabits of traffic, and it's embedded and distributed across our entire network fabric to avoid contention. So it really is better equipped to handle the volumes.

      3 replies 0 retweets 1 like
      Colm MacCárthaigh‏ @colmmacc May 18
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      Replying to @colmmacc @0xtf

      Every time I say that contention is a 'possibility' here, I mean if we didn't have these limits. But we do have the limits, so the AWS Network keeps its high reliability and performance.

      12:40 PM - 18 May 2020
      • 1 Like
      • Giorgio Bonfiglio (@ ::1)
      1 reply 0 retweets 1 like
        1. New conversation
        2. 𝕿𝖎𝖆𝖌𝖔 𝕱𝖆𝖗𝖎𝖆‏ @0xtf May 18
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          Replying to @colmmacc

          Thank you for the explanation Colm. I'm sure that this feature can't be easy to maintain (from your side) at scale, so I don't doubt that the limitations that are in place are useful. That being said, I still believe there are many aspects of this feature that were 1/n

          1 reply 0 retweets 0 likes
        3. 𝕿𝖎𝖆𝖌𝖔 𝕱𝖆𝖗𝖎𝖆‏ @0xtf May 18
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          Replying to @0xtf @colmmacc

          dramatically changed since they were first introduced and partners, like us, started to depend on them. I'd love to talk more about this but Twitter isn't the most friendly way of doing it. Would you be OK with an alternative way of discussing this further?

          0 replies 0 retweets 0 likes
        4. End of conversation

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