[fdsaaf]

I am extremely skeptical of "full" rows in the table, the ones that purport to measure the overall costs of cache invalidation. These costs are so workload specific that a single number is meaningless and likely to mislead. My own benchmarks show costs that are nowhere near the ones cited.

[no-bugs]

> My own benchmarks show costs that are nowhere near the ones cited.

This is heavily dependent on the benchmark. In the OP, there is a ref to an academic research showing these numbers - and from my own real-world experience (NOT artificial benchmarks), the costs of 10K-100K are very usual. From a completely different perspective - there should be reasons why nginx beats Apache performance-wise :-).