Julian Elischer wrote:
Oleksandr Samoylyk wrote:
Dear developers,
Please read this thread:
http://lists.freebsd.org/pipermail/freebsd-net/2008-May/017891.html
I'm using no encryption and no compression in mpd, so netgraph should
fly.
It seems to get bad after 500 sessions...
In FreeBSD 6 - it's swi1: net - 100% CPU
In FreeBSD 7 - it's em0 taskq - 100% CPU
unfortunatly I've been totally ignoring this thread because it said
"trouble with em" in the topic..
If you'd said
trouble with mpd then maybe I'd have looked earlier..
After playing with it I can make guess that's a netgraph problem.
Maybe it's a poor design in netgraph the way it handle its tables and
it's is probably not designed to add so many interfaces.
how many?
# vmstat -m | grep netgraph
netgraph_msg 0 0K - 1355522 64,128,256,512,1024
netgraph_node 12110 3028K - 28829 256
netgraph_hook 29648 3706K - 66104 128
netgraph 8076 12663K - 15209 64,256,1024,4096
netgraph_sock 4 1K - 5489 128
netgraph_path 1 1K - 728112 16,32
netgraph_mppc 0 0K - 1 1024
netgraph_ksock 1349 169K - 3414 128
netgraph_iface 1346 169K - 2367 128
netgraph_ppp 1346 16152K - 2367
netgraph_bpf 16020 2003K - 33296 128
# ifconfig -a | grep ng | wc -l
1341
I saw a peak with about 1900 ng interfaces. That was tooo sloowwww....
last pid: 39304; load averages: 1.12, 1.23, 1.20
up 0+01:15:38 22:39:04
93 processes: 10 running, 70 sleeping, 13 waiting
CPU states: 0.3% user, 0.0% nice, 15.3% system, 3.1% interrupt, 81.3%
idle
Mem: 46M Active, 7772K Inact, 109M Wired, 128K Cache, 16M Buf, 7756M Free
Swap: 4096M Total, 4096M Free
PID USERNAME THR PRI NICE SIZE RES STATE C TIME WCPU COMMAND
819 root 23 50 0 92764K 36424K select 1 0:00 207.18% mpd5
17 root 1 171 ki31 0K 16K RUN 1 71:41 100.00%
idle: cpu1
14 root 1 171 ki31 0K 16K CPU4 4 69:16 100.00%
idle: cpu4
15 root 1 171 ki31 0K 16K CPU3 3 68:11 100.00%
idle: cpu3
29 root 1 -68 - 0K 16K CPU6 6 60:50 100.00% em0
taskq
18 root 1 171 ki31 0K 16K CPU0 0 71:58 97.17% idle:
cpu0
16 root 1 171 ki31 0K 16K CPU2 2 68:13 95.65% idle:
cpu2
11 root 1 171 ki31 0K 16K CPU7 7 66:23 86.38% idle:
cpu7
13 root 1 171 ki31 0K 16K CPU5 5 65:28 71.97% idle:
cpu5
19 root 1 -44 - 0K 16K WAIT 5 19:53 31.59% swi1: net
30 root 1 -68 - 0K 16K - 7 8:41 12.89% em1 taskq
12 root 1 171 ki31 0K 16K RUN 6 12:41 0.00% idle:
cpu6
20 root 1 -32 - 0K 16K WAIT 3 1:12 0.00% swi4:
clock
# uname -v
FreeBSD 7.0-STABLE #0: Mon May 5 01:11:23 EEST 2008
CPU: Intel(R) Xeon(R) CPU E5335 @ 2.00GHz (2000.01-MHz
K8-class CPU)
Origin = "GenuineIntel" Id = 0x6f7 Stepping = 7
Features=0xbfebfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE>
Features2=0x4e33d<SSE3,RSVD2,MON,DS_CPL,VMX,TM2,SSSE3,CX16,xTPR,PDCM,DCA>
AMD Features=0x20100800<SYSCALL,NX,LM>
AMD Features2=0x1<LAHF>
Cores per package: 4
FreeBSD/SMP: Multiprocessor System Detected: 8 CPUs
usable memory = 8580038656 (8182 MB)
avail memory = 8292810752 (7908 MB)
# ngctl list
ngctl: send msg: No buffer space available
# cat /boot/loader.conf
loader_logo="beastie"
autoboot_delay="3"
hw.em.rxd="1024"
hw.em.txd="1024"
net.inet.tcp.tcbhashsize="4096"
kern.ipc.maxpipekva="32000000"
net.graph.recvspace="128000"
net.graph.maxdgram="128000"
Linux with poptop was running quit smoothly. I thought that netgraph
would be fast as hell.
--
Oleksandr Samoylyk
OVS-RIPE
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