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Published 20 hours ago • verified publisher icon alibaba-edu

Packet loss occurs after PFC is triggered

Open liulalala opened this issue 4 years ago • 2 comments

Hi, yuliang. I have runned a 1000-scale incast simulation based on your code, where each flow consists of one BDP packets (ie, 8 MTU packets). PFC is triggered. Unfortunately, packet loss also occurs, which means that PFC does not take much effects. Can you help me fixing this bug on PFC? Or give me some advice? Thanks a lot!!!

The topology I used is a two-tier topology (the same topology used in Homa), which consists 9 ToR switches and 4 core switches, connected via 40Gbps links. Each ToR switch connect with 16 servers via a 10Gbps links.

liulalala avatar Jan 22 '21 09:01 liulalala

Hi,

if you have 9 ToR * 16 server/ToR = 144 servers, how do you get 1000-scale incast?

liyuliang001 avatar Jan 23 '21 20:01 liyuliang001

Each server generates several flows, i.e, 1000/144 = 6.9 flows per server on average. btw, the buffer size is set to 8MB.

liulalala avatar Jan 24 '21 00:01 liulalala