dummynet dropping too many packets

[rihad]

Eugene Grosbein wrote:
> On Mon, Oct 05, 2009 at 07:30:15PM +0500, rihad wrote:
> 
>>>> How do I investigate and fix this burstiness issue?
>>> Please also show:
>>>
>>> sysctl net.isr
>>> sysctl net.inet.ip.intr_queue_maxlen
>> net.isr.swi_count: 65461359
>> net.isr.drop: 0
>> net.isr.queued: 32843752
>> net.isr.deferred: 0
>> net.isr.directed: -723075002
>> net.isr.count: -723074001
>> net.isr.direct: 1
>>
>> net.inet.ip.intr_queue_maxlen: 50
> 
> What is CPU load in when the load is maximum?
> 
It has 2 quad-cores, so I'm not sure. Here's the output of top -S:
   PID USERNAME    THR PRI NICE   SIZE    RES STATE  C   TIME   WCPU COMMAND
    11 root          1 171 ki31     0K    16K CPU7   7 120.2H 98.39% 
idle: cpu7
    12 root          1 171 ki31     0K    16K CPU6   6 120.3H 95.75% 
idle: cpu6
    16 root          1 171 ki31     0K    16K CPU2   2 115.5H 93.99% 
idle: cpu2
    14 root          1 171 ki31     0K    16K CPU4   4 114.6H 91.89% 
idle: cpu4
    18 root          1 171 ki31     0K    16K RUN    0  97.7H 88.96% 
idle: cpu0
    13 root          1 171 ki31     0K    16K CPU5   5 117.5H 85.35% 
idle: cpu5
    15 root          1 171 ki31     0K    16K CPU3   3 110.2H 79.79% 
idle: cpu3
    29 root          1 -68    -     0K    16K WAIT   1  59.1H 54.05% 
irq256: bce0
    17 root          1 171 ki31     0K    16K CPU1   1  63.5H 42.29% 
idle: cpu1
   467 root          1 -68    -     0K    16K -      3  21.4H 11.57% 
dummynet
    19 root          1 -32    -     0K    16K WAIT   4 268:29  3.66% 
swi4: clock sio
    31 root          1 -68    -     0K    16K WAIT   2 310:19  2.98% 
irq257: bce1
    30 root          1 -64    -     0K    16K WAIT   6  40:02  0.29% 
irq16: mfi0
     3 root          1  -8    -     0K    16K -      5  55:42  0.00% g_up
     4 root          1  -8    -     0K    16K -      1  51:22  0.00% g_down
    22 root          1  44    -     0K    16K -      3  13:30  0.00% yarrow
    21 root          1 -44    -     0K    16K WAIT   0   9:09  0.00% 
swi1: net
    51 root          1  20    -     0K    16K syncer 2   7:25  0.00% syncer
   599 root          1  44    0  5660K  1132K select 0   1:40  0.00% syslogd
    52 root          1 -16    -     0K    16K sdflus 5   0:34  0.00% 
softdepflush
     2 root          1  -8    -     0K    16K -      2   0:31  0.00% g_event