#bufferbloat

[viniciuspaes]

Tutorial como resolver problema de Bufferbloat com OpenWRT

Aprenda a resolver problemas de bufferbloat em sua rede configurando o OpenWRT com SQM/QoS, IRQbalance e Packet Steering!

Objetivos

Entender o que é o BufferBloat

Saber o significado de QoS e SQM

Aprender sobre Packet Steering e IRQbalance

Passo a passo para resolver problemas de BufferBloat do seu roteador configurado com OpenWRT

Acesso: Tutorial como resolver problema de Bufferbloat com OpenWRT

[midagedgamerguy]

SQM- Configure it right or don't bother! (Ubiquiti Edgerouter X)

[midagedgamerguy]

Bufferbloat Banishment - Ubiquiti Edgerouter-X comparisons

[dieswaytoofast]

errno: good for humans, lousy for encoding actual errors Dave Taht (°) hacks on libc to, amongst other things, nuke errno. Why? "C has errnos. Show me one program that actually checks for and does something correct for every possible errno a function can return, and I’ll buy you lunch. Maybe the space shuttle did, I don’t know. We’ve certainly crashed enough other spacecraft."(°°) Towards that, in *ebusI* everything embeds the error return as part of the return. e.g. mmap returns a negative value with the 10 possible errors encoded into it (there’s a side function that can turn that new value into a errno and look it up). (°) Fighting the good fight against #bufferbloat since...forever (°°) If you want to collect, tell him @dieswaytoofast sent you 😇

[dieswaytoofast]

In particular, ° Latency spikes in the middle of a traceroute mean absolutely nothing if they do not continue forward. Because ° Latency is based on 1. Time to get to router, plus 2. Time to generate the ICMP TTL, plus 3. The return to the SRC. *AND* ° Item -2- is, basically, *NOT* correlated to real world latency! Bonus : ICMP ingress and egress can (and usually are?) from different interfaces, even though RFC1812 says they MUST be the same. Imagine a world... https://lnkd.in/eWKeBCY #NetworkTools

[shortercringely]

Pro-tip for prognosticators: if you hedge your predictions with "the beginning of", pretty much no matter what happens, you can claim success the next year.

(“Bob’s Big Picture technology predictions for 2017″)

[dieswaytoofast]

OK, this is more about #tcpip, #BBR, and measuring round trip latency, but hey, cool tools are cool... Also, re: why measure this, "it’s quite common for net­work glitches to happen from time to time, es­pe­cially when you rent space from a cloud pro­vider. So having a tool to mon­itor track per­form­ance of in­di­vidual net­work flows can be very useful when trying to debug a per­form­ance is­sue."

[dieswaytoofast]

Note: it's voluntary - The clients are expected to honour the capacity grant, the lease length, and the refresh interval. There is no protection from clients misbehaving!