[progbits]

> DeepFlow can even analyze code performance through network profiling under old version kernels (2.6+).

This is an interesting call-out, the last release of 2.6 is from 2011. I wonder who is still running that in production.

[sharangxy]

Some of our users’ ancestral processes are running on kernel 2.6, and the operations staff dare not upgrade the kernel. Indeed, there are many limitations in 2.6, but the simple traffic analysis has brought surprising insights to users. However, this also brings some troubles: even if a problem is known, no one dares to easily modify the code to fix it, unless absolutely necessary :)