What is kernel{if_io_tqg}? 100% load of core

V

vlad1983

Please tell me, what is processes kernel{if_io_tqg_?}, on my server they load core on 100%.
Code: 
last pid: 99557;  load averages:  6.35,  6.34,  6.30                                                    up 0+21:28:59  21:12:00
507 threads:   14 running, 475 sleeping, 18 waiting
CPU 0:  0.0% user,  0.0% nice,  100% system,  0.0% interrupt,  0.0% idle
CPU 1: 11.4% user,  0.0% nice, 19.6% system,  0.4% interrupt, 68.6% idle
CPU 2:  0.0% user,  0.0% nice, 99.6% system,  0.4% interrupt,  0.0% idle
CPU 3: 11.4% user,  0.0% nice, 17.3% system,  0.4% interrupt, 71.0% idle
CPU 4:  0.0% user,  0.0% nice,  100% system,  0.0% interrupt,  0.0% idle
CPU 5: 12.9% user,  0.0% nice, 20.4% system,  1.2% interrupt, 65.5% idle
CPU 6:  0.0% user,  0.0% nice,  100% system,  0.0% interrupt,  0.0% idle
CPU 7: 13.7% user,  0.0% nice, 12.9% system,  0.4% interrupt, 72.9% idle
Mem: 385M Active, 949M Inact, 2296M Wired, 4008M Free
ARC: 1379M Total, 463M MFU, 775M MRU, 1243K Anon, 15M Header, 126M Other
     980M Compressed, 2185M Uncompressed, 2.23:1 Ratio
Swap: 4096M Total, 4096M Free

  PID USERNAME    PRI NICE   SIZE    RES STATE    C   TIME     CPU COMMAND
    0 root        -76    -      0  5136K CPU4     4  17.3H 100.00% [kernel{if_io_tqg_4}]
    0 root        -76    -      0  5136K CPU2     2  17.0H  99.61% [kernel{if_io_tqg_2}]
    0 root        -76    -      0  5136K CPU0     0  17.0H  99.51% [kernel{if_io_tqg_0}]
    0 root        -76    -      0  5136K CPU6     6  17.3H  93.83% [kernel{if_io_tqg_6}]
   11 root        155 ki31      0   128K CPU7     7  17.2H  71.66% [idle{idle: cpu7}]
   11 root        155 ki31      0   128K CPU3     3  17.1H  71.64% [idle{idle: cpu3}]
   11 root        155 ki31      0   128K RUN      1  16.9H  71.23% [idle{idle: cpu1}]
   11 root        155 ki31      0   128K CPU5     5  17.2H  70.12% [idle{idle: cpu5}]

Code: 
# uname -a
FreeBSD  12.0-RELEASE FreeBSD 12.0-RELEASE r341666 GENERIC  amd64

Code: 
# netstat -h 1
            input        (Total)           output
   packets  errs idrops      bytes    packets  errs      bytes colls
      300k     0     0       227M       255k  1.6k       200M     0
      239k     0     0       168M       233k  1.9k       154M     0
      362k     0     0       274M       344k  1.9k       261M     0
      330k     0     0       246M       322k  1.8k       236M     0
 
I'm not entirely sure but it appears to be related to a task queue for interfaces (part of iflib(4)). What (network) interfaces does the machine have? And do you have a lot of network traffic?
 
Hi,
I have a similar issue on one of our internet serving Freebsd router. Periodically the router is throttling a traffic from 1Gb/s to 100Mb/s without any obvious reason.

kernel{if_io_tqg_?} are going to almost 100% load in top.
The system has ipfw and pf enabled.
uname -a:
FreeBSD 12.2-RELEASE-p9 FreeBSD 12.2-RELEASE-p9 GENERIC amd64

Where to look to diagnose the problem?
Please help.
 
SirDice said:
Use one or the other, not both.
Click to expand...
One is doing shaping and the other is doing NAT. It's a historical desicion and can't be changed easily.

We have two other routers and they work just fine even with bigger loads.

The one that is throttling a traffic has little load
1698319907927.png
 
The problem with enabling two firewalls is that their operation is undefined. So it may work or it may not, there's zero consistency.
 
SirDice said:
The problem with enabling two firewalls is that their operation is undefined. So it may work or it may not, there's zero consistency.
Click to expand...
This setup is working almost 8 years now and we had no problems with this combination. And I never have heard about undefined operation of IPFW and PF.
 
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