>У тебя netgraph не пашет. 
>покажи netstat -m2544/10266/12810 mbufs in use (current/cache/total)
2360/3534/5894/25600 mbuf clusters in use (current/cache/total/max)
2360/3528 mbuf+clusters out of packet secondary zone in use (current/cache)
0/0/0/0 4k (page size) jumbo clusters in use (current/cache/total/max)
0/0/0/0 9k jumbo clusters in use (current/cache/total/max)
0/0/0/0 16k jumbo clusters in use (current/cache/total/max)
5876K/9634K/15511K bytes allocated to network (current/cache/total)
0/0/0 requests for mbufs denied (mbufs/clusters/mbuf+clusters)
0/0/0 requests for jumbo clusters denied (4k/9k/16k)
0/4/6656 sfbufs in use (current/peak/max)
0 requests for sfbufs denied
0 requests for sfbufs delayed
0 requests for I/O initiated by sendfile
0 calls to protocol drain routines
>top -S 5
last pid: 37046;  load averages:  0.00,  0.01,  0.00   up 15+00:57:47  16:33:18
71 processes:  2 running, 50 sleeping, 19 waiting
CPU states:  1.1% user,  0.0% nice,  0.4% system,  5.6% interrupt, 92.9% idle
Mem: 32M Active, 286M Inact, 178M Wired, 24K Cache, 112M Buf, 1505M Free
Swap: 998M Total, 998M Free
  PID USERNAME   THR PRI NICE   SIZE    RES STATE    TIME   WCPU COMMAND
   10 root         1 171   52     0K     8K RUN    270.8H 93.55% idle
   12 root         1 -32 -151     0K     8K WAIT    38.2H  1.46% swi4: clock
   11 root         1 -44 -163     0K     8K WAIT    48.8H  0.10% swi1: net
41565 root         3  20    0  8468K  6608K kserel  84:50  0.00% mpd4
   14 root         1 -16    0     0K     8K -       48:06  0.00% yarrow
>sysctl -a | grep buf 
kern.ipc.maxsockbuf: 262144
kern.ipc.sockbuf_waste_factor: 8
kern.ipc.nsfbufsused: 0
kern.ipc.nsfbufspeak: 4
kern.ipc.nsfbufs: 6656
cluster_save buffer     0     0K       -      402  32,64
   BIO buffer     0     0K       -      119  2048
     mbuf_tag  1948   487K       -7381499446  32,64,256
         sbuf     0     0K       -    29006  16,32,64,128,256,512,1024,2048,4096
       devbuf  2332  6810K       -     4681  16,32,64,128,256,512,1024,2048,4096
kern.msgbuf_clear: 0
kern.msgbuf: eject TCP 192.168.1.76:4444 85.238.124.128:11288 in via ng100
kern.consmsgbuf_size: 8192
mbuf_jumbo_1:  16384,        0,      0,      0,        0
mbuf_jumbo_9:   9216,        0,      0,      0,        0
mbuf_jumbo_p:   4096,        0,      0,      0,        0
mbuf_cluster:   2048,    25600,   5888,      6,     5888
mbuf:            256,        0,   6091,   6719, 16152600265
mbuf_packet:     256,        0,   9179,   3631, 10307200375
vfs.nfs.bufpackets: 4
vfs.getnewbufrestarts: 0
vfs.getnewbufcalls: 1068488
vfs.hifreebuffers: 812
vfs.lofreebuffers: 406
vfs.numfreebuffers: 7222
vfs.dirtybufthresh: 1643
vfs.hidirtybuffers: 1826
vfs.lodirtybuffers: 913
vfs.numdirtybuffers: 2
vfs.altbufferflushes: 0
vfs.dirtybufferflushes: 0
vfs.bufdefragcnt: 0
vfs.buffreekvacnt: 0
vfs.bufreusecnt: 7180
vfs.hibufspace: 117702656
vfs.lobufspace: 117637120
vfs.maxmallocbufspace: 5885132
vfs.bufmallocspace: 0
vfs.maxbufspace: 118358016
vfs.bufspace: 117637120
vfs.runningbufspace: 0
vfs.reassignbufcalls: 652972
net.bpf.maxbufsize: 524288
net.bpf.bufsize: 4096
debug.sizeof.buf: 328
security.bsd.unprivileged_read_msgbuf: 1
>укажи железо - проц, память. 
dual core 2000 на ядро
2Гб ддр2