Page 1 of 1
ksoftirqd
Posted: 08 Aug 2011, 17:18
by Krister
I'm having trouble with ksoftirqd which is taking 25% CPU on my B2 and slowing down the system. Rebooting does not help.
Does anyone know why it takes 25% CPU?
//Krister
Re: ksoftirqd
Posted: 09 Aug 2011, 00:37
by Cheeseboy
Hi Krister,
Have you got any hardware attached to your Bubba?
Have a look at this:
http://www.tin.org/bin/man.cgi?section= ... =ksoftirqd
Perhaps you could ask Ubi if you could join the Munin club? That will give you better stats, even if they are sometimes mysterious....
Cheers,
Cheeseboy
Re: ksoftirqd
Posted: 09 Aug 2011, 06:44
by willem2
On my BubbaTwo the CPU time from ksoftirqd is ath9k (atheros wifi) related.
You can check with:
results after 6 days uptime:
Code: Select all
CPU0
16: 4250 IPIC Level serial
18: 3273180484 IPIC Level ath9k
19: 0 IPIC Level mpc8xxx_spi
20: 1252900 IPIC Level sata_sil
21: 0 IPIC Level phy_interrupt
22: 1371 IPIC Level i2c-mpc
23: 0 IPIC Level i2c-mpc
24: 0 IPIC Level talitos
32: 1453346 IPIC Level eth0_tx
33: 2187563 IPIC Level eth0_rx
34: 0 IPIC Level eth0_er
35: 744666 IPIC Level eth1_tx
36: 587431 IPIC Level eth1_rx
37: 0 IPIC Level eth1_er
38: 43 IPIC Level ehci_hcd:usb1
48: 0 IPIC Level phy_interrupt
71: 0 IPIC Level fsldma-device, fsldma-channel, fsldma-channel, fsldma-channel, fsldma-channel
74: 0 IPIC Level bubbatwo
BAD: 10
and with the command below you can see the amount of interrupts growing:
Code: Select all
watch "grep ath9k /proc/interrupts"
But until now I haven't found a solution for my wifi problems on B2
Re: ksoftirqd
Posted: 09 Aug 2011, 06:47
by Cheeseboy
Ah, I have the non-wifi model of the B2....
Re: ksoftirqd
Posted: 09 Aug 2011, 07:11
by RandomUsername
You could try the new beta release, see if it's fixed -
http://forum.excito.net/viewtopic.php?f ... 260#p16259
Re: ksoftirqd
Posted: 09 Aug 2011, 10:06
by Krister
Thanks,
I found that it is ath9k that generates interrupts and slows down my wifi network.
//Krister
Re: ksoftirqd
Posted: 09 Aug 2011, 16:13
by johannes
The ath9k is the wifi chipset, and the interrupts are probably correct responses to network events.
Re: ksoftirqd
Posted: 11 Aug 2011, 03:44
by Krister
Hi Johannes,
I've shut down all my wifi clients but ksoftirqd still takes about 25% CPU.
//Krister
Re: ksoftirqd
Posted: 07 Feb 2012, 16:43
by Nöbbe
I have a similar problem, ksoftirqd uses 40-50% of my B2 CPU. When using the watch command on the interrupts file I see that the ath9k get about 25 000 interrupts every second.
Does this sound normal?
Edit: Added logs of the ksoftirqd cpu usage (from top) and ath9k interrupts from /proc/interrupts taken about every second. There is a time stamp as well in the log.