MSM710 performance optimizations

[amgorb]

Hi!

We've got MSM710 with 8 MSM410 and one MSM460, average number of wireless clients are 60-90 and i've got ridiculous CPU usage numbers:

Firmware Version: 5.5.3.0-01-10326 Load 1min: 3.68 Total RAM: 130666496
Uptime: 2 days, 20:19:19 Load 5min: 3.69 Free RAM: 3776512
Board Revision: 50-00-1029-00:35 Load 15min: 3.48 Buffer RAM: 20406272
Serial Number: xx CPU use now: 93% Cache RAM: 41840640
CPU 5sec ago: 98% [Storage use]
CPU 10sec ago: 97% Permanent: 6%
CPU 20sec ago: 100% Temporary: 6%

The most CPU consuming process are ksoftirqd_CPU0 and postmaster:

3 root RW 0 1 27.6 0.0 ksoftirqd_CPU0
390 root S 5180 305 10.5 4.0 postmaster

sometimes regng comes and eats about 10-20%

and i see a lot of works comes to PostgreSQL processess

  390  5180  41.7  888744 R    postgres: postgres postgres [local] VACUUM

or

422  5924  21.1  172124 R    postgres: scdb postgres [local] SELECT

Question is: how i can decrease the load, which ways to optimize, maybe some services to disable?