Hello, All (NetMap dev. Team) !
We use netmap-ipfw server for traffic pre-processing before the main
filtering bridge (ordinary dummynet) and met the situation, that
netmap-ipfw dramatically degrades perfomance (point B below) from stable
work (point A below) after some actions with ruleset.
A. Server with netmap-ipfw shows very stable work with following
settings:
1. kipfw starts as ./kipfw netmap:ix0 netmap:ix1
2. current statement of sysctl variables:
...
dev.netmap.ring_size: 128000
dev.netmap.ring_curr_size: 128000
dev.netmap.buf_curr_size: 4096
dev.netmap.buf_num: 896000
dev.netmap.buf_curr_num: 896000
dev.netmap.ix_rx_miss: 2020539039
dev.netmap.ix_rx_miss_bufs: 1478979631
....
in /boot/loader.conf :
hw.ix.rxd=4096
hw.ix.txd=4096
3. traffic at one of interfaces (ix1):
root@bridge-netmap:/usr/local/netmap-ipfw/ipfw # netstat -bdh -w1 -I
ix1
input ix1 output
packets errs idrops bytes packets errs bytes colls
drops
628K 0 0 737M 517K 0 106M 0
0
636K 0 0 749M 522K 0 105M 0
0
633K 0 0 744M 527K 0 105M 0
0
635K 0 0 744M 523K 0 107M 0
0
4. system load:
CPU 0: 58.7% user, 0.0% nice, 33.5% system, 3.9% interrupt, 3.9%
idle
CPU 1: 0.0% user, 0.0% nice, 0.0% system, 3.9% interrupt, 96.1%
idle
CPU 2: 0.0% user, 0.0% nice, 0.0% system, 3.5% interrupt, 96.5%
idle
CPU 3: 0.0% user, 0.0% nice, 0.4% system, 2.8% interrupt, 96.9%
idle
Mem: 22M Active, 243M Inact, 4125M Wired, 814M Buf, 3429M Free
Swap: 4096M Total, 4096M Free
PID USERNAME PRI NICE SIZE RES STATE C TIME WCPU
COMMAND
853 root 101 0 7087M 415M CPU0 0 17.5H 93.90% kipfw
Sometimes kipfw takes all 100% of the first core (20-40 sec) but
without any affect to traffic volume.
B. Unstable work of the server begins when we add such rules to the
ruleset:
./ipfw pipe 10 config mask dst-ip 0xffffffff bw 5120Kbit/s
./ipfw add pipe 10 ip from any to 192.168.0.0/16
by these rules we assign the same bandwidth to each IP's from
192.168.0.0/16 (approx 20K in a whole)
After entering rules the server some minutes works good, and we see
that in this time RES figure grows (not fast) from 415M to 500M, and
than RES jumps from about 510M to 540M
and network traffic downs at least twice, kipfw takes 100%, large
packet drops (up to 30%) and delay grows.
root@bridge-netmap:/usr/local/etc/rc.d # netstat -bdh -w1 -I ix1
input ix1 output
packets errs idrops bytes packets errs bytes colls
drops
648K 0 0 762M 534K 0 110M 0
0
643K 0 0 755M 529K 0 111M 0
0
648K 0 0 763M 534K 0 112M 0
0
648K 0 0 760M 537K 0 113M 0
0
215K 0 0 240M 211K 0 35M 0
0 !!!! (rules were entered into ruleset)
220K 0 0 235M 210K 0 34M 0
0
212K 0 0 236M 211K 0 35M 0
0
215K 0 0 240M 212K 0 35M 0
0
May be there is any limit (for example 512Mb) of mem usage ? If yes -
can it be increased ?
We can give any additional information if it be useful for
investigating of this issue.
Azamat
IT Dep
AkNet ISP
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