[mistwang]

Originally Posted by eva2000

2. raising apachebench concurrency from 200 to 400, litespeed cache still pushes out consistent 16k rps vs varnish which drops to under 9k rps. But pushing concurrency from 200 to 600, has the situation reversed with litespeed cache dropping from 1st, 2nd and 3rd run = 16k, 11k, down to just 330 rps on 3rd run (disk i/o ?) vs varnish dropping to consistent 7.5k rps.

Likely a problem with kernel socket limits, there should not be big differences when you run the benchmark test multiple times.

Try adding "-k" option to "ab".