Packet loss with traffic shaper and routing

Hello all!

We have a machine working as a router and bandwidth limiter for our
network. It routes the traffic through two 'bge' interfaces utilizing only
public IPs. No NAT is used. We only have IPFW rules for traffic shaping by
MAC addresses.
It works fine, but we have been experiencing high latency and packet loss.
There is no other major services in this machine, cpu utilization is low,
memory is fine, no disk activity, but load average is always around 1.5 or
2, even if I disable IPFW layer 2 filtering.
Network traffic is not greater than 12 Mbit/s.

The system is a FreeBSD 5.4-RELEASE, running on a dual CPU: Intel(R)
Xeon(TM) CPU 3.06GHz (3051.47-MHz 686-class CPU) compiled with SMP kernel:
cpu0 (BSP): APIC ID: 0
cpu1 (AP): APIC ID: 1
cpu2 (AP): APIC ID: 6
cpu3 (AP): APIC ID: 7


top output:

last pid: 14039; load averages: 1.61, 1.62, 1.56
37 processes: 1 running, 35 sleeping, 1 zombie
CPU states: 0.0% user, 0.0% nice, 1.4% system, 30.8% interrupt, 67.8% idle
Mem: 16M Active, 421M Inact, 149M Wired, 688K Cache, 112M Buf, 1417M Free
Swap: 1024M Total, 1024M Free

PID USERNAME PRI NICE SIZE RES STATE C TIME WCPU CPU COMMAND
6245 root 96 0 2672K 2236K select 2 3:48 0.00% 0.00% dhcpd
329 root 96 0 1328K 892K select 0 2:48 0.00% 0.00% syslogd
453 root 96 0 3384K 2508K select 2 0:33 0.00% 0.00% sshd




systat -iostat output:

/0 /1 /2 /3 /4 /5 /6 /7 /8 /9 /10
Load Average ||||||||||

/0 /10 /20 /30 /40 /50 /60 /70 /80 /90 /100
cpu user|
nice|
system|
interrupt|XXXXXXXXXXXXXXXXX
idle|XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

/0 /10 /20 /30 /40 /50 /60 /70 /80 /90 /100
da0 MB/s
tps|X
pass0 MB/s
tps|


Can anyone give me some advice?
Thank you in advance!


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