RE: [question] IPC queue filling-up problem?

-----Message d'origine-----
De : linux-kernel-owner@xxxxxxxxxxxxxxx
[mailto:linux-kernel-owner@xxxxxxxxxxxxxxx] De la part de Eric Dumazet

On Wed, 5 Sep 2007 09:37:50 -0400
"Fortier,Vincent [Montreal]" <Vincent.Fortier1@xxxxxxxx> wrote:


Hi all,

We are testing new hardware and planning a switch from our old
redhat
7.3 to a Debian Etch 4.0 for our radar forecast analysis systems.
We
found out that our main IPC dispatcher software module would use
100%
of a CPU all the time and that the IPC queues would fill up quickly
on a
2.6 kernel. We first tought that it would be a problem of
compatibility between a 2.4 vs 2.6 IPC calls vs our radar analysis
software but after a lot of work we have been able to test a 2.4
kernel on that same hardware and got the exact same problem.

So curiously, on our actual systems (see SYSTEM 1 below) our IPC
dispatcher module works like a charm and queues gets near 0. On our

test system which are way more powerfull systems (see SYSTEM 2) our
IPC dispatcher module queue fills up rapidly (depending of the
msgmnb
queue size it will wimply take a bit longer to fill).

We have tested both our already compiled binaries from rh73 using
gcc
2.9 and a recompiled version of the modules on a debian sarge system

and got the exact same problem on either a Debian Sarge 3.1 (running
a
2.4 or 2.6 kernel) and on a Etch 64bit system (using 32bit compat
layer) with a 2.6 kernel. In all cases the queues would simply
fill-up.

After strac'ing the module I noticed that the time needed to handle
the signal & ipc calls are way lower on the new system hence I don't

see why the dispatcher queue does fill-up like that?!?!?!

Does anyone experienced something similar? Could this be a kernel
issue vs material, kernel option? Might this be related to libc?

Help / Clues very much appreciated.

Hi Vincent

top shows that something is eating cpu cycles in User mode on
your new platform, while old platform consumes cycles both in
User and System land.

This might be related to some programing error, maybe some
spinlock in user mode or bad multi-threading synchronization,
or scheduling assumptions, that break because of the quad
core cpus of your new machine.

Actually, could this be worth trying (adding Ingo in CC):
http://lkml.org/lkml/2007/9/5/75

So the thread that is supposed to consume IPC messages is not
scheduled in time, because CPU starves. (beware the four
cores of each CPU compete for ressources)

You could issue "ps auxm" to check which threads are spining
in User mode and try to trace them ?

Effectively in this specific test case I had 5 stuck process using each
100% of a CPU... although 3 other cores where still available so there
is (I believe) no reason why it should had starved that much.

Anyhow, that did not happend on all the other testing I made during the
past 3 weeks (except this one).

I restarted the this test (again using a 2.4.35.1 kernel), mde sure no
process where stuck :), and grabbed the ps aux + ipcs -q info (attached)

Again, the ipcs -q shows that the queue is getting full comparing to
SYSTEM 1 which always has a queue of 0.

Note: Also attached a top.txt file showing that the dispatcher uses 100%
of a CPU on SYSTEM 2. This never occurs on SYSTEM 1.

Eric

PS, thnx for replying.

- vin

SYSTEM INFORMATION:

SYSTEM 1:
---------
HPDL580 G2
Quad Intel Xeon 1.90GHz
4G ram
DRBD disks on dual-gigabit adapter
OS: RedHat 7.3 / kernel: 2.4.33 / libc: 2.2.5 / gcc 2.96

SYSTEM 2:
---------
Dell PE2950
Dual Intel Quad-Core 2.66GHz
16G ram
local 300G 15000 RPM SCSI.
OS1: Debian Etch 4.0 / kernels 2.6.18 -> 2.6.22 / libc 2.3.6 / gcc
4.1.2
OS2: Debian Sarge 3.1 / kernels 2.4.35, 2.6.18 -> 2.6.22 / libc
2.3.2 / gcc 3.3.5

------ Message Queues --------
key msqid owner perms used-bytes messages
0x41018018 0 urp 660 60784 748
0x41018024 32769 urp 660 0 0
0x4101800b 65538 urp 660 0 0
0x41018011 98307 urp 660 0 0
0x4101800e 131076 urp 660 0 0
0x4101803f 163845 urp 660 0 0
0x41018019 196614 urp 660 0 0
0x41018026 229383 urp 660 0 0
0x4101802f 262152 urp 660 0 0
0x4101803a 294921 urp 660 0 0
0x41018036 327690 urp 660 0 0
0x4101802b 360459 urp 660 0 0
0x41018040 393228 urp 660 0 0
0x41018027 425997 urp 660 0 0
0x41018028 458766 urp 660 0 0
0x41018020 491535 urp 660 0 0
0x4101800c 524304 urp 660 0 0
0x4101800d 557073 urp 660 0 0
0x4101803c 589842 urp 660 0 0
0x4101802e 622611 urp 660 0 0
0x41018021 655380 urp 660 0 0
0x41018006 688149 urp 660 0 0
0x4101802a 720918 urp 660 0 0
0x4101800a 753687 urp 660 0 0
0x4101801e 786456 urp 660 0 0
0x41018029 819225 urp 660 0 0
0x41018037 851994 urp 660 0 0
0x41018038 884763 urp 660 0 0
0x41018022 917532 urp 660 0 0

USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND
root 1 0.4 0.0 1492 500 ? - 10:06 0:04 init [2]
root - 0.4 - - - - S 10:06 0:04 -
root 2 0.0 0.0 0 0 ? - 10:06 0:00 [keventd]
root - 0.0 - - - - S 10:06 0:00 -
root 3 0.0 0.0 0 0 ? - 10:06 0:00 [ksoftirqd_CPU0]
root - 0.0 - - - - SN 10:06 0:00 -
root 4 0.0 0.0 0 0 ? - 10:06 0:00 [ksoftirqd_CPU1]
root - 0.0 - - - - SN 10:06 0:00 -
root 5 0.0 0.0 0 0 ? - 10:06 0:00 [ksoftirqd_CPU2]
root - 0.0 - - - - SN 10:06 0:00 -
root 6 0.0 0.0 0 0 ? - 10:06 0:00 [ksoftirqd_CPU3]
root - 0.0 - - - - SN 10:06 0:00 -
root 7 0.0 0.0 0 0 ? - 10:06 0:00 [ksoftirqd_CPU4]
root - 0.0 - - - - SN 10:06 0:00 -
root 8 0.0 0.0 0 0 ? - 10:06 0:00 [ksoftirqd_CPU5]
root - 0.0 - - - - SN 10:06 0:00 -
root 9 0.0 0.0 0 0 ? - 10:06 0:00 [ksoftirqd_CPU6]
root - 0.0 - - - - SN 10:06 0:00 -
root 10 0.0 0.0 0 0 ? - 10:06 0:00 [ksoftirqd_CPU7]
root - 0.0 - - - - SN 10:06 0:00 -
root 11 0.0 0.0 0 0 ? - 10:06 0:00 [kswapd]
root - 0.0 - - - - S 10:06 0:00 -
root 12 0.0 0.0 0 0 ? - 10:06 0:00 [bdflush]
root - 0.0 - - - - S 10:06 0:00 -
root 13 0.0 0.0 0 0 ? - 10:06 0:00 [kupdated]
root - 0.0 - - - - S 10:06 0:00 -
root 26 0.0 0.0 0 0 ? - 10:06 0:00 [scsi_eh_0]
root - 0.0 - - - - S 10:06 0:00 -
root 66 0.0 0.0 0 0 ? - 10:06 0:00 [kjournald]
root - 0.0 - - - - S 10:06 0:00 -
root 85 0.0 0.0 2920 2036 ? - 10:06 0:00 /sbin/devfsd /dev
root - 0.0 - - - - Ss 10:06 0:00 -
root 190 0.0 0.0 0 0 ? - 10:06 0:00 [khubd]
root - 0.0 - - - - S 10:06 0:00 -
root 231 0.0 0.0 0 0 ? - 10:06 0:00 [kjournald]
root - 0.0 - - - - S 10:06 0:00 -
root 232 0.0 0.0 0 0 ? - 10:06 0:00 [kjournald]
root - 0.0 - - - - S 10:06 0:00 -
root 233 0.0 0.0 0 0 ? - 10:06 0:00 [kjournald]
root - 0.0 - - - - S 10:06 0:00 -
root 234 0.0 0.0 0 0 ? - 10:06 0:00 [kjournald]
root - 0.0 - - - - S 10:06 0:00 -
root 236 0.0 0.0 0 0 ? - 10:06 0:00 [xfsbufd]
root - 0.0 - - - - S 10:06 0:00 -
root 237 0.0 0.0 0 0 ? - 10:06 0:00 [xfslogd/0]
root - 0.0 - - - - S 10:06 0:00 -
root 238 0.0 0.0 0 0 ? - 10:06 0:00 [xfslogd/1]
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root 239 0.0 0.0 0 0 ? - 10:06 0:00 [xfslogd/2]
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root 240 0.0 0.0 0 0 ? - 10:06 0:00 [xfslogd/3]
root - 0.0 - - - - S 10:06 0:00 -
root 241 0.0 0.0 0 0 ? - 10:06 0:00 [xfslogd/4]
root - 0.0 - - - - S 10:06 0:00 -
root 242 0.0 0.0 0 0 ? - 10:06 0:00 [xfslogd/5]
root - 0.0 - - - - S 10:06 0:00 -
root 243 0.0 0.0 0 0 ? - 10:06 0:00 [xfslogd/6]
root - 0.0 - - - - S 10:06 0:00 -
root 244 0.0 0.0 0 0 ? - 10:06 0:00 [xfslogd/7]
root - 0.0 - - - - S 10:06 0:00 -
root 245 0.0 0.0 0 0 ? - 10:06 0:00 [xfsdatad/0]
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root - 0.0 - - - - S 10:06 0:00 -
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root - 0.0 - - - - S 10:06 0:00 -
root 252 0.0 0.0 0 0 ? - 10:06 0:00 [xfsdatad/7]
root - 0.0 - - - - S 10:06 0:00 -
root 253 0.0 0.0 0 0 ? - 10:06 0:00 [xfssyncd]
root - 0.0 - - - - S 10:06 0:00 -
root 254 0.0 0.0 0 0 ? - 10:06 0:01 [kjournald]
root - 0.0 - - - - S 10:06 0:01 -
daemon 436 0.0 0.0 1608 452 ? - 10:06 0:00 /sbin/portmap
daemon - 0.0 - - - - Ss 10:06 0:00 -
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root - 0.1 - - - - Ss 10:07 0:01 -
root 523 0.0 0.0 2176 1236 ? - 10:07 0:00 /sbin/klogd
root - 0.0 - - - - Ss 10:07 0:00 -
clamav 609 0.0 0.0 3032 1228 ? - 10:07 0:00 /usr/bin/freshclam -d --quiet
clamav - 0.0 - - - - Ss 10:07 0:00 -
root 619 0.0 0.0 5784 2664 ? - 10:07 0:00 /usr/sbin/cupsd -F
root - 0.0 - - - - Ss 10:07 0:00 -
message 622 0.0 0.0 2476 976 ? - 10:07 0:00 /usr/bin/dbus-daemon-1 --system
message - 0.0 - - - - Ss 10:07 0:00 -
root 634 0.0 0.0 2504 1072 ? - 10:07 0:00 /usr/sbin/lisa
root - 0.0 - - - - Ss 10:07 0:00 -
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rwhod - 0.0 - - - - Ss 10:07 0:00 -
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postfix - 0.0 - - - - S 10:07 0:00 -
postfix 806 0.0 0.0 2996 1100 ? - 10:07 0:00 qmgr -l -t fifo -u -c
postfix - 0.0 - - - - S 10:07 0:00 -
root 808 0.0 0.0 4048 1568 ? - 10:07 0:00 /usr/sbin/sshd
root - 0.0 - - - - Ss 10:07 0:00 -
root 814 0.0 0.0 3048 820 ? - 10:07 0:00 /usr/sbin/vsftpd
root - 0.0 - - - - Ss 10:07 0:00 -
root 823 0.0 0.0 2084 840 ? - 10:07 0:00 /usr/sbin/xinetd -pidfile /var/run/xinetd.pid -stayalive
root - 0.0 - - - - Ss 10:07 0:00 -
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root - 0.0 - - - - Ss 10:07 0:00 -
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www-data - 0.0 - - - - S 10:07 0:00 -
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www-data - 0.0 - - - - S 10:07 0:00 -
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www-data - 0.0 - - - - S 10:07 0:00 -
root 860 0.0 0.0 1484 472 vc/1 - 10:07 0:00 /sbin/getty 38400 tty1
root - 0.0 - - - - Ss+ 10:07 0:00 -
root 861 0.0 0.0 1484 472 vc/2 - 10:07 0:00 /sbin/getty 38400 tty2
root - 0.0 - - - - Ss+ 10:07 0:00 -
root 862 0.0 0.0 1484 472 vc/3 - 10:07 0:00 /sbin/getty 38400 tty3
root - 0.0 - - - - Ss+ 10:07 0:00 -
root 863 0.0 0.0 1484 472 vc/4 - 10:07 0:00 /sbin/getty 38400 tty4
root - 0.0 - - - - Ss+ 10:07 0:00 -
root 864 0.0 0.0 1484 472 vc/5 - 10:07 0:00 /sbin/getty 38400 tty5
root - 0.0 - - - - Ss+ 10:07 0:00 -
root 865 0.0 0.0 1484 472 vc/6 - 10:07 0:00 /sbin/getty 38400 tty6
root - 0.0 - - - - Ss+ 10:07 0:00 -
root 872 0.0 0.0 6892 2084 ? - 10:07 0:00 sshd: root@pts/0
root - 0.0 - - - - Ss 10:07 0:00 -
root 874 0.0 0.0 3884 1844 pts/0 - 10:07 0:00 -zsh
root - 0.0 - - - - Ss 10:07 0:00 -
root 885 0.0 0.0 7212 2236 ? - 10:07 0:00 sshd: root@pts/1
root - 0.0 - - - - Ss 10:07 0:00 -
root 890 0.0 0.0 3884 1844 pts/1 - 10:08 0:00 -zsh
root - 0.0 - - - - Ss 10:08 0:00 -
urp 895 0.0 0.0 4352 2384 pts/1 - 10:08 0:00 -su
urp - 0.0 - - - - S 10:08 0:00 -
urp 944 0.0 0.0 3384 1916 pts/0 - 10:09 0:00 -su
urp - 0.0 - - - - S 10:09 0:00 -
urp 22762 90.9 0.0 12292 11304 pts/1 - 10:14 9:24 URPDispatcher
urp - 90.9 - - - - R 10:14 9:24 -
urp 22805 18.6 0.1 57636 31292 pts/1 - 10:14 1:55 bin/URPJobMaker
urp - 18.6 - - - - R 10:14 1:55 -
urp 22822 2.4 0.1 34996 23228 pts/1 - 10:14 0:14 bin/URPCappi
urp - 2.4 - - - - S 10:14 0:14 -
urp 22836 0.3 0.0 15320 12780 pts/1 - 10:14 0:02 bin/URPConvPPI
urp - 0.3 - - - - S 10:14 0:02 -
urp 22850 0.4 0.0 19584 12224 pts/1 - 10:14 0:02 bin/URPClogzPPI
urp - 0.4 - - - - S 10:14 0:02 -
urp 22865 0.6 0.0 20160 13168 pts/1 - 10:14 0:04 bin/URPVrPPI
urp - 0.6 - - - - S 10:14 0:04 -
urp 22880 2.4 0.1 26552 20420 pts/1 - 10:14 0:14 bin/URPEchoTop
urp - 2.4 - - - - S 10:14 0:14 -
urp 22897 0.7 0.0 15920 13140 pts/1 - 10:14 0:04 bin/URPMaxR
urp - 0.7 - - - - S 10:14 0:04 -
urp 22911 0.3 0.0 16512 13456 pts/1 - 10:14 0:02 bin/URPPrecip
urp - 0.3 - - - - S 10:14 0:02 -
urp 22925 1.0 0.1 21932 18908 pts/1 - 10:14 0:06 bin/URPSvrWx
urp - 1.0 - - - - S 10:14 0:06 -
urp 22939 0.0 0.0 10504 9032 pts/1 - 10:14 0:00 bin/URPRFA
urp - 0.0 - - - - S 10:14 0:00 -
urp 22953 2.3 0.1 42032 19324 pts/1 - 10:14 0:13 bin/URPPA
urp - 2.3 - - - - S 10:14 0:13 -
urp 22970 5.0 0.1 28532 21524 pts/1 - 10:14 0:29 bin/URPVVW
urp - 5.0 - - - - S 10:14 0:29 -
urp 23004 0.3 0.0 16704 13020 pts/1 - 10:14 0:01 bin/URPMesoCyclone
urp - 0.3 - - - - S 10:14 0:01 -
urp 23018 0.1 0.0 14668 11208 pts/1 - 10:14 0:00 bin/URPMicroBurst
urp - 0.1 - - - - S 10:14 0:00 -
urp 23032 0.0 0.0 12556 10424 pts/1 - 10:14 0:00 bin/URPGust
urp - 0.0 - - - - S 10:14 0:00 -
urp 23056 1.1 0.0 26996 14180 pts/1 - 10:14 0:06 bin/URPCellID
urp - 1.1 - - - - S 10:14 0:06 -
urp 23073 3.8 0.0 22948 13000 pts/1 - 10:14 0:22 bin/URPCellProps
urp - 3.8 - - - - S 10:14 0:22 -
urp 23089 0.0 0.0 10632 9068 pts/1 - 10:15 0:00 bin/URPTracker
urp - 0.0 - - - - S 10:15 0:00 -
urp 23103 0.3 0.0 17476 11940 pts/1 - 10:15 0:01 bin/URPPPI
urp - 0.3 - - - - S 10:15 0:01 -
urp 23147 1.9 0.1 23568 19508 pts/1 - 10:15 0:11 bin/URPHail
urp - 1.9 - - - - S 10:15 0:11 -
urp 23161 0.0 0.0 10828 9248 pts/1 - 10:15 0:00 bin/URPAssessmwin
urp - 0.0 - - - - S 10:15 0:00 -
urp 23178 1.3 0.0 25124 16312 pts/1 - 10:15 0:08 bin/URPNids
urp - 1.3 - - - - S 10:15 0:08 -
urp 23192 0.0 0.0 12520 9848 pts/1 - 10:15 0:00 bin/URPBWER
urp - 0.0 - - - - S 10:15 0:00 -
urp 23206 0.3 0.0 16660 11600 pts/1 - 10:15 0:02 bin/URPGradient
urp - 0.3 - - - - S 10:15 0:02 -
urp 23220 0.0 0.0 10724 9372 pts/1 - 10:15 0:00 bin/URPMultiRadarMerge
urp - 0.0 - - - - S 10:15 0:00 -
urp 23234 0.0 0.0 10696 9072 pts/1 - 10:15 0:00 bin/URPSAC
urp - 0.0 - - - - S 10:15 0:00 -
urp 23251 0.0 0.0 10500 9004 pts/1 - 10:15 0:00 bin/URPSCIT
urp - 0.0 - - - - S 10:15 0:00 -
urp 23265 0.4 0.0 10360 9188 pts/1 - 10:15 0:02 bin/URPIngester
urp - 0.4 - - - - S 10:15 0:02 -
root 24580 0.0 0.0 7048 2100 ? - 10:17 0:00 sshd: root@pts/2
root - 0.0 - - - - Ss 10:17 0:00 -
root 24601 0.0 0.0 4712 2132 pts/2 - 10:17 0:00 -zsh
root - 0.0 - - - - Ss 10:17 0:00 -
root 24623 0.0 0.0 2572 588 pts/2 - 10:17 0:00 tail -f urplog.log
root - 0.0 - - - - S+ 10:17 0:00 -
urp 26020 0.0 0.0 2024 500 pts/0 - 10:24 0:00 sleep 2
urp - 0.0 - - - - S+ 10:24 0:00 -
urp 26021 0.0 0.0 2292 728 pts/1 - 10:24 0:00 ps auxm
urp - 0.0 - - - - R+ 10:24 0:00 -
top - 10:45:13 up 38 min, 3 users, load average: 1.31, 1.40, 1.30
Tasks: 119 total, 5 running, 114 sleeping, 0 stopped, 0 zombie
Cpu0 : 100.0% user, 0.0% system, 0.0% nice, 0.0% idle
Cpu1 : 1.3% user, 0.0% system, 0.0% nice, 98.7% idle
Cpu2 : 0.7% user, 0.0% system, 0.0% nice, 99.3% idle
Cpu3 : 32.3% user, 0.0% system, 0.0% nice, 67.7% idle
Cpu4 : 0.7% user, 0.3% system, 0.0% nice, 99.0% idle
Cpu5 : 0.0% user, 0.0% system, 0.0% nice, 100.0% idle
Cpu6 : 0.0% user, 0.0% system, 0.0% nice, 100.0% idle
Cpu7 : 0.0% user, 0.0% system, 0.0% nice, 100.0% idle
Mem: 16567608k total, 3797076k used, 12770532k free, 442836k buffers
Swap: 2048276k total, 0k used, 2048276k free, 2690988k cached

PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
31337 urp 18 0 11308 11m 548 R 99.9 0.1 7:53.39 URPDispatcher
31373 urp 9 0 32296 31m 612 S 31.0 0.2 2:05.00 URPJobMaker
31667 urp 9 0 14132 13m 716 S 1.0 0.1 0:03.81 URPCellID
31838 urp 9 0 11632 11m 704 S 1.0 0.1 0:01.47 URPGradient
885 root 9 0 2236 2236 1732 S 0.3 0.0 0:00.22 sshd
31424 urp 18 0 12228 11m 11m S 0.3 0.1 0:01.32 URPClogzPPI
31444 urp 10 0 12696 12m 700 R 0.3 0.1 0:02.46 URPVrPPI
580 urp 10 0 992 992 760 R 0.3 0.0 0:00.55 top
1205 urp 16 0 13420 13m 11m R 0.3 0.1 0:00.01 URPClogzPPI
1206 urp 18 0 13420 13m 11m R 0.3 0.1 0:00.01 URPClogzPPI
1 root 8 0 500 500 448 S 0.0 0.0 0:04.38 init
2 root 9 0 0 0 0 S 0.0 0.0 0:00.00 keventd
3 root 18 19 0 0 0 S 0.0 0.0 0:00.00 ksoftirqd_CPU0
4 root 18 19 0 0 0 S 0.0 0.0 0:00.00 ksoftirqd_CPU1
5 root 19 19 0 0 0 S 0.0 0.0 0:00.00 ksoftirqd_CPU2
6 root 18 19 0 0 0 S 0.0 0.0 0:00.00 ksoftirqd_CPU3
7 root 18 19 0 0 0 S 0.0 0.0 0:00.00 ksoftirqd_CPU4
8 root 19 19 0 0 0 S 0.0 0.0 0:00.00 ksoftirqd_CPU5
9 root 18 19 0 0 0 S 0.0 0.0 0:00.00 ksoftirqd_CPU6
10 root 18 19 0 0 0 S 0.0 0.0 0:00.00 ksoftirqd_CPU7
11 root 9 0 0 0 0 S 0.0 0.0 0:00.03 kswapd
12 root 9 0 0 0 0 S 0.0 0.0 0:00.00 bdflush
13 root 9 0 0 0 0 S 0.0 0.0 0:00.11 kupdated
26 root 9 0 0 0 0 S 0.0 0.0 0:00.00 scsi_eh_0
66 root 9 0 0 0 0 S 0.0 0.0 0:00.04 kjournald
85 root 9 0 2036 2036 648 S 0.0 0.0 0:00.02 devfsd
190 root 9 0 0 0 0 S 0.0 0.0 0:00.00 khubd
231 root 9 0 0 0 0 S 0.0 0.0 0:00.00 kjournald
232 root 9 0 0 0 0 S 0.0 0.0 0:00.00 kjournald
233 root 9 0 0 0 0 S 0.0 0.0 0:00.01 kjournald
234 root 9 0 0 0 0 S 0.0 0.0 0:00.21 kjournald
236 root 9 0 0 0 0 S 0.0 0.0 0:00.00 xfsbufd
237 root 9 0 0 0 0 S 0.0 0.0 0:00.00 xfslogd/0
238 root 9 0 0 0 0 S 0.0 0.0 0:00.00 xfslogd/1
239 root 9 0 0 0 0 S 0.0 0.0 0:00.00 xfslogd/2
240 root 9 0 0 0 0 S 0.0 0.0 0:00.00 xfslogd/3
241 root 9 0 0 0 0 S 0.0 0.0 0:00.00 xfslogd/4

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