netisr traffic bad distribution between CPUs

[Коньков Евгений]

http://piccy.info/view3/2678766/170dd8875b0a18e00b00445d373e64a6/orig/
http://piccy.info/view3/2678742/4f522bdf95d34e6ddbb3502bb5f5caaf/orig/
abruptly problems 20-00: traffic fall, CPU load raise with no changes
at traffice type.

but no problems at 17-00 even with more traffice flow

problem also abruptly disappears after some time: two or three hours


# netstat -Q
Configuration:
Setting                        Current        Limit
Thread count                         4            4
Default queue limit                256        10240
Direct dispatch               disabled          n/a
Forced direct dispatch        disabled          n/a
Threads bound to CPUs         disabled          n/a

Protocols:
Name   Proto QLimit Policy Flags
ip         1   1024   flow   ---
igmp       2    256 source   ---
rtsock     3    256 source   ---
arp        7    256 source   ---
ip6       10    256   flow   ---

Workstreams:
WSID CPU   Name     Len WMark   Disp'd  HDisp'd   QDrops   Queued  Handled
   0   0   ip       401  1024        0        0  2620979 2131108484 2131107410
   0   0   igmp       0     0        0        0        0        0        0
   0   0   rtsock     0   162        0        0        0    78610    78610
   0   0   arp        0     9        0        0        0   189978   189978
   0   0   ip6        0     2        0        0        0      832      832
   1   1   ip         0   744        0        0        0 805541655 805541655
   1   1   igmp       0     0        0        0        0        0        0
   1   1   rtsock     0     0        0        0        0        0        0
   1   1   arp        0     4        0        0        0    96599    96599
   1   1   ip6        0     1        0        0        0     2602     2602
   2   2   ip        25  1024        0        0     8173 1817809104 1817809050
   2   2   igmp       0     0        0        0        0        0        0
   2   2   rtsock     0     0        0        0        0        0        0
   2   2   arp        0    20        0        0        0   278757   278757
   2   2   ip6        0     1        0        0        0     1095     1095
   3   3   ip        82  1024        0        0   187757 1551553992 1551553909
   3   3   igmp       0     0        0        0        0        0        0
   3   3   rtsock     0     0        0        0        0        0        0
   3   3   arp        0     8        0        0        0   562346   562346
   3   3   ip6        0     3        0        0        0    10843    10843

FreeBSD  9.0-CURRENT FreeBSD 9.0-CURRENT #4: Fri Jun 10 01:30:12 UTC 2011     @:/usr/obj/usr/src/sys/PAE_KES  i386