BIND 9.x caching Performance under heavy loads

[Srini Avirneni]

We are looking to hear peoples experiences with heavily loaded caching
servers (> 2500 queries/Sec) running on linux (RH ES 3.0 Kernel
2.4.x). We have used various builds of BIND 9.x (9.2.3, 9.2.4, 9.3.0,
9.3.1rc1) and also 8.4.5.

Our results show in all cases that BIND falls on its face with CPU
time increasing from 20% at startup to 80+ % over 24 hour period.
Cache Size typically ranges from 800MB to 1GB. Expermenting with lower
cache sizes showed no improvement.

Any shared experience is welcome.

thanks
-S