> My guess is that I'll have to create a custom scheduler and apply to
> interfaces to be able to have all that buffer space available for basic
> Internet...
This is actually something we've needed to do on lot of 1RU switches
for 20 years. Catalysts at least since 3550 has not shipped with QoS
96ms was based on your proposal that EX4200 is 12MB, which it is not,
it's 2.5MB, so it's 20ms @ 1Gbps.
If we're talking about uncongested device then the worst case is 10GE
=> 1GE step down, where you need to potentially queue the tcp window
growth to reach 1Gbps. Only reason to queue at 10GE
Thanks everyone for your input, very interesting.
Reality is, we have ~300Mbps coming in the 10G port and ~50-100Mbps per
customer port at peaks, really, not that much.
Also, although tweaking TCP is nice, I can hardly go to each customer of
mine telling them to augment their TCP window settings
On May 30, 2019, at 2:23 AM, Saku Ytti wrote:
>
> 12MB / 1Gbps == 96ms. That would be massive buffer.
Not if you're Arista... ;-)
You're correct that it's 96ms for the 1Gbps side, but if packets are arriving
at 10Gbps then that's only 9.6ms (ish) before you run out of buffer. It's the
On Thu, 30 May 2019 at 04:06, Jason Healy wrote:
> There really isn't any clever way around it; I think those switches have 12MB
> of buffer (or is that the QFX?). Anyway, if you do the math you quickly find
> out that works out to like 10ms of traffic, so the switch simply can't buffer
>
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