On Mon, Jun 29, 2009 at 10:47:44AM +0200, Paweł Staszewski wrote:

But
With all this patches i have the same problem with CPU load
Every time when route cache entries are purged cpu load is increasing  
from 1% to 40 / 80% it depends

I see that on 64bit machine when route cache entries are going down i  
have almost 80% load on each cpu where ethernet card is binded by  
smp_affinity
But on 32bit machine cpu load reported by mpstat is half that on 64bit  
machine
here is example from 32bit machine ( mpstat + rtstat -k entries )

Linux 2.6.29.5 (TM_02_C1)       06/29/09        _i686_  (2 CPU)

12:36:54     CPU    %usr   %nice    %sys %iowait    %irq   %soft  %steal  
%guest   %idle        RT CACHE ENTRIES (from rtstat)
12:36:57     all    0.00    0.00    0.00    0.00    1.51   15.08    0.00  
  0.00   83.42        83346

I guess Eric is thinking about this. Btw., two little suggestions:
it should be easier to track if these route cache reports stay in its
starting thread ("weird problem"?), and if you could send these
stats/logs as attachements or turn off line wrapping, please? ;-)

Thanks,
Jarek P.