[AusNOG] Deep buffer switches and CDN networks

Jason Leschnik jason at leschnik.me
Sat May 25 12:44:46 EST 2019

Hi Tom,

Appreciate both of your comments. Perfectly timed video from Netflix too,
thanks for pointing me towards it!

@Paul Wilkins <paulwilkins369 at gmail.com>  I think that's what confused me
the most around deeper buffers. I get how they could help with burst
absorption for applications which sometimes might contend with each other.
But for an openconnect box (or other type of CDN) I can only assume
North-South traffic is constantly going to be coming in thick and fast. No
amount of buffering is going to fix what is essentially a big to little
pipe scenario.

The bigger buffers may come in useful for clocking (PPM) differences
between like interfaces, but this would from what I understand only really
help to make the benchmarks/marketing material look better.

Thanks all!


On Fri, 24 May 2019 at 23:31, Tom Paseka <tom at cloudflare.com> wrote:

> Timely presentation from Netflix On this exact topic.
> https://ripe78.ripe.net/archives/video/128/
> On Thu, May 23, 2019 at 7:52 AM Tom Paseka <tom at cloudflare.com> wrote:
>> everything depends on your application and how you're moving traffic.
>> if you lots of east-west flow (between equal speed interfaces, especially
>> in many to one) you'll need buffers. If you're doing north to south traffic
>> with interface change, you'll likely need buffers.
>> The choice here might not have been for deep buffer, but for other
>> capabilities (forwarding, route table size, etc). Dave mentions from a
>> question there is no east-west traffic, everything is south-north.
>> On Wed, May 22, 2019 at 5:46 AM Jason Leschnik <jason at leschnik.me> wrote:
>>> Hi Noggers,
>>> I just finished watching the NANOG presentation of Netflix
>>> openconnect[1], I noticed that their core switch of choice was an Arista
>>> 7500E which is a deep buffer switch. I remember seeing a lot of comments
>>> around buffer bloat for deep buffer switches. Would this be considered an
>>> acceptable use case for this type of switch in the DC?
>>> Has anyone got experience with ideal switch types (shallow, deep
>>> buffers) for edge CDN network deployments?
>>> [1] - https://www.youtube.com/watch?v=tbqcsHg-Q_o
>>> Regards,
>>> Jason.
>>> _______________________________________________
>>> AusNOG mailing list
>>> AusNOG at lists.ausnog.net
>>> http://lists.ausnog.net/mailman/listinfo/ausnog
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