Please prove that it is the network's fault - the lost Envoy sidecar
· โ˜• 4 min read
Network quality issues such as packet loss can be discovered, quantified, and monitored using Envoy sidecar. During testing, Envoy can be used as an egress on the client side such as JMeter to monitor traffic. This article discusses one of the implementation solutions.
Flow control and backpressure of Envoy/Istio
· โ˜• 14 min read
Like all proxy software, Envoy takes flow control seriously because CPU/memory resources are limited. But flow control is never a simple matter. It involves all the players in the data flow path. This article tries to explain the principles and synergies involved.
My new book - Istio & Envoy Insider
· โ˜• 3 min read
Istio & Envoy Insider - A book focus on Envoy Proxy & Istio mechanism and implementation deep dive
How an Asian Dad Keeps Learning English After a Layoff from an English-Speaking Workplace
· โ˜• 7 min read

I’m an Asian Dad living in Mainland China. I was recently laid off from an English-speaking workplace due to geopolitical factors. However, I am determined to continue improving my English skills, even without the daily immersion of a professional English environment.

Why keep learning English?

English skills are crucial for my career growth and personal development for several reasons:

  • Global Job Opportunities
    English is the lingua franca of the global tech industry. Proficiency opens doors to international teams, global job markets, and collaborative projects that span multiple countries.

Envoy WASM Network Filter to fix illegal HTTP Header
· โ˜• 5 min read
The normal HTTP request was responded with HTTP status code 400 after migrating to Istio. The problem traffic has HTTP headers that do not comply with the HTTP 1.1 specification. So I try to develop an Envoy WASM Network Filter to fix the illegal HTTP Header.
My real-life Istio Performance Tuning - Part 1
· โ˜• 7 min read

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Why tuning

If it takes interest and momentum to push a new technology, then what is needed to get this technology go to live production is hard working. Including Cloud Native and Istio.
In pre-launch performance testing, Istio out-of-box provided observability, operational convenience, and also introduced pain: Increased service latency. How to minimize latency has become a critical task.

My Scenario:

  • SERVICE-A invoke SERVICE-B
  • Latency of Service-A, which was previously 9ms at P50, is now 14ms at P50.

Bottleneck Analysis

There are two paths under my feet: