[Bug 732980] New: Loading module mISDN_dsp makes ksoftirqd use high % of CPU time
https://bugzilla.novell.com/show_bug.cgi?id=732980 https://bugzilla.novell.com/show_bug.cgi?id=732980#c0 Summary: Loading module mISDN_dsp makes ksoftirqd use high % of CPU time Classification: openSUSE Product: openSUSE 12.1 Version: Final Platform: x86-64 OS/Version: SuSE Other Status: NEW Severity: Normal Priority: P5 - None Component: Kernel AssignedTo: kernel-maintainers@forge.provo.novell.com ReportedBy: claude.diderich@yahoo.com QAContact: qa@suse.de Found By: --- Blocker: --- User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:8.0) Gecko/20100101 Firefox/8.0 When loading the ISDN modules mISDN_core and then mISDN_dsp into the kernel using modprobe, the soft irq handler ksoftirqd usses high % of CPU time on one core of the processor(s) installed in the system. PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 10 root 20 0 0 0 0 S 47 0.0 1:53.77 ksoftirqd/1 Unloading the module mISDN_dsp from the kernel, makes the usage diappear again. Issue has been reproduced on two different machines under openSUSE 12.1 with different hardware (one with ISDN adapter and one without). Kernel is Linux joshua 3.1.0-1.2-default #1 SMP Thu Nov 3 14:45:45 UTC 2011 (187dde0) x86_64 x86_64 x86_64 GNU/Linux dmesg shows Modular ISDN core version 1.1.21 NET: Registered protocol family 34 DSP modul 2.0 mISDN_dsp: DSP clocks every 64 samples. This equals 2 jiffies. Reproducible: Always Steps to Reproduce: 1. modprobe mISDN_core 2. modprobe mISDN_dsp 3. Watch CPU usage, for example through top Actual Results: Machine spends lot of time in ksoftirqd PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 10 root 20 0 0 0 0 S 47 0.0 1:53.77 ksoftirqd/1 Expected Results: Machine spends no time in ksoftirqd (result shown after unloading mISDN_dsp and mISDN_core) PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 10 root 20 0 0 0 0 S 0 0.0 3:03.77 ksoftirqd/1 ISDN functionality is not affected (at least none could be identified). -- Configure bugmail: https://bugzilla.novell.com/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are on the CC list for the bug.
https://bugzilla.novell.com/show_bug.cgi?id=732980 https://bugzilla.novell.com/show_bug.cgi?id=732980#c1 Jeff Mahoney <jeffm@suse.com> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|NEW |NEEDINFO CC| |jeffm@suse.com InfoProvider| |claude.diderich@yahoo.com --- Comment #1 from Jeff Mahoney <jeffm@suse.com> 2012-03-25 21:34:23 EDT --- Can you reproduce this with kernel-vanilla? -- Configure bugmail: https://bugzilla.novell.com/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are on the CC list for the bug.
https://bugzilla.novell.com/show_bug.cgi?id=732980 https://bugzilla.novell.com/show_bug.cgi?id=732980#c2 Claude Diderich <claude.diderich@yahoo.com> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|NEEDINFO |NEW CC| |claude.diderich@yahoo.com InfoProvider|claude.diderich@yahoo.com | --- Comment #2 from Claude Diderich <claude.diderich@yahoo.com> 2012-03-26 17:18:22 UTC --- Yes, unfortunately the issues can be reproduced with kernel-vanilla. Additional kernel modules manually loaded at start-up are: mISDN_core, mISDN_dsp, hfcmulti. $ uname -a Linux joshua 3.1.9-1.4-vanilla #1 SMP Fri Jan 27 08:55:10 UTC 2012 (efb5ff4) x86_64 x86_64 x86_64 GNU/Linux". $ uptime 18:59pm up 0:11, 1 user, load average: 0.00, 0.15, 0.20 $ ps aux USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND root 1 0.5 0.0 37468 4956 ? Ss 18:47 0:03 /sbin/init root 2 0.0 0.0 0 0 ? S 18:47 0:00 [kthreadd] root 3 30.5 0.0 0 0 ? S 18:47 3:41 [ksoftirqd/0] ... $ dmesg | egrep "(ISDN|DSP)" [ 76.376121] Modular ISDN core version 1.1.21 [ 76.382214] DSP modul 2.0 [ 76.382218] mISDN_dsp: DSP clocks every 64 samples. This equals 2 jiffies. [ 76.394374] mISDN: HFC-multi driver 2.03 $ modprobe -l | grep ISDN kernel/drivers/isdn/hardware/mISDN/hfcpci.ko kernel/drivers/isdn/hardware/mISDN/hfcmulti.ko kernel/drivers/isdn/hardware/mISDN/hfcsusb.ko kernel/drivers/isdn/hardware/mISDN/avmfritz.ko kernel/drivers/isdn/hardware/mISDN/speedfax.ko kernel/drivers/isdn/hardware/mISDN/mISDNinfineon.ko kernel/drivers/isdn/hardware/mISDN/w6692.ko kernel/drivers/isdn/hardware/mISDN/netjet.ko kernel/drivers/isdn/hardware/mISDN/mISDNipac.ko kernel/drivers/isdn/hardware/mISDN/mISDNisar.ko kernel/drivers/isdn/mISDN/mISDN_core.ko kernel/drivers/isdn/mISDN/mISDN_dsp.ko kernel/drivers/isdn/mISDN/l1oip.ko $ cat /proc/modules | grep ISDN kernel/drivers/isdn/hardware/mISDN/hfcpci.ko kernel/drivers/isdn/hardware/mISDN/hfcmulti.ko kernel/drivers/isdn/hardware/mISDN/hfcsusb.ko kernel/drivers/isdn/hardware/mISDN/avmfritz.ko kernel/drivers/isdn/hardware/mISDN/speedfax.ko kernel/drivers/isdn/hardware/mISDN/mISDNinfineon.ko kernel/drivers/isdn/hardware/mISDN/w6692.ko kernel/drivers/isdn/hardware/mISDN/netjet.ko kernel/drivers/isdn/hardware/mISDN/mISDNipac.ko kernel/drivers/isdn/hardware/mISDN/mISDNisar.ko kernel/drivers/isdn/mISDN/mISDN_core.ko kernel/drivers/isdn/mISDN/mISDN_dsp.ko kernel/drivers/isdn/mISDN/l1oip.ko $ cat /proc/mdstat | egrep "(hfc|ISDN)" hfcmulti 79594 2 - Live 0xffffffffa01ec000 mISDN_dsp 208391 0 - Live 0xffffffffa02a0000 mISDN_core 93874 8 hfcmulti,mISDN_dsp, Live 0xffffffffa01c7000 -- Configure bugmail: https://bugzilla.novell.com/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are on the CC list for the bug.
https://bugzilla.novell.com/show_bug.cgi?id=732980 https://bugzilla.novell.com/show_bug.cgi?id=732980#c3 Jeff Mahoney <jeffm@suse.com> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|NEW |NEEDINFO InfoProvider| |claude.diderich@yahoo.com --- Comment #3 from Jeff Mahoney <jeffm@suse.com> 2012-03-26 13:31:36 EDT --- Ok. Thanks. I'm afraid we don't have any ISDN experts to debug this. Can you file a report at bugzilla.kernel.org and link to the report here? -- Configure bugmail: https://bugzilla.novell.com/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are on the CC list for the bug.
https://bugzilla.novell.com/show_bug.cgi?id=732980 https://bugzilla.novell.com/show_bug.cgi?id=732980#c4 Jiri Slaby <jslaby@suse.com> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|NEEDINFO |RESOLVED CC| |jslaby@suse.com InfoProvider|claude.diderich@yahoo.com | Resolution| |NORESPONSE --- Comment #4 from Jiri Slaby <jslaby@suse.com> 2013-06-24 06:59:52 UTC --- If/when you have any new findings, please reopen. -- Configure bugmail: https://bugzilla.novell.com/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are on the CC list for the bug.
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