How to obtain what swi1:net is doing?

[Ivan Voras]

On 11/11/10 20:20, Коньков Евгений wrote:
> Hi, all

"How to obtain what swi1:net  is doing?"

The short answer is: depending on what your network card is, it could be 
everything related to TCP/IP-level processing.

In your case, you are doing a lot of work in netgraph and dummynet, 
probably shaping, but have high dummynet usage which probably means its 
handling the lower level of network IO, probably with a high packet rate.

You might try including the following loader.conf tunables:

net.isr.direct_force=0
net.isr.maxthreads=2

... and report if it helps you. (but be careful: here you must measure 
real-world performance not CPU usage!)


> last pid: 65736;  load averages:  3.54,  4.46,  3.92    up 4+07:51:26  21:19:08
> 215 processes: 8 running, 195 sleeping, 12 waiting
> CPU 0:  2.9% user,  0.0% nice, 42.9% system, 11.4% interrupt, 42.9% idle
> CPU 1:  0.0% user,  0.0% nice, 54.3% system, 17.1% interrupt, 28.6% idle
> CPU 2:  2.9% user,  0.0% nice, 57.1% system,  5.7% interrupt, 34.3% idle
> CPU 3:  0.0% user,  0.0% nice, 45.7% system, 17.1% interrupt, 37.1% idle
> Mem: 502M Active, 87M Inact, 324M Wired, 24M Cache, 112M Buf, 1053M Free
> Swap: 20G Total, 72K Used, 20G Free
>
>    PID USERNAME   PRI NICE   SIZE    RES STATE  C   TIME   WCPU COMMAND
>     15 root       -44    -     0K     8K CPU1   3  31.4H 71.39% swi1: net
>     35 root       -68    -     0K     8K CPU0   0  21.7H 50.20% dummynet
>     14 root       171 ki31     0K     8K RUN    0  74.8H 42.87% idle: cpu0
>     11 root       171 ki31     0K     8K CPU3   3  78.4H 31.79% idle: cpu3
>     13 root       171 ki31     0K     8K RUN    1  80.3H 29.69% idle: cpu1
>     12 root       171 ki31     0K     8K RUN    2  76.9H 23.49% idle: cpu2
>   1698 root       -68    -     0K     8K sleep  2 312:30 15.38% ng_queue0
>   1700 root       -68    -     0K     8K sleep  3 313:02 15.09% ng_queue2
>   1699 root       -68    -     0K     8K sleep  2 314:18 14.89% ng_queue1
>   1701 root       -68    -     0K     8K sleep  1 312:54 14.06% ng_queue3
> 63829 www         50    0   185M   123M select 0   0:47  4.05% httpd
> 59213 root        96    0   400M 61940K CPU3   2  32:24  2.98% rtorrent
>     16 root       -32    -     0K     8K WAIT   2 129:41  0.39% swi4: clock sio