High interrupt CPU in top...

[Adam Vande More]

On Mon, Oct 27, 2014 at 4:37 PM, Peter Harrison <
four.harrisons at googlemail.com> wrote:

>
>
> On 27 October 2014 21:31, Adam Vande More <amvandemore at gmail.com> wrote:
>
>> On Mon, Oct 27, 2014 at 3:59 PM, Peter Harrison <
>> four.harrisons at googlemail.com> wrote:
>>
>>> Can anyone help me diagnose this please? I'm on 10.0-RELEASE on a
>>> Thinkpad
>>> X200s. In top I see around 30% CPU listed as 'interrupt' even when I'm
>>> only
>>> running Xorg (with Xfce as the window manager) with no other applications
>>> open:
>>>
>>> last pid:  1946;  load averages:  1.09,  1.30,  1.24
>>>                             up 0+00:59:59  21:56:20
>>> 54 processes:  1 running, 53 sleeping
>>> CPU:  0.4% user,  0.0% nice,  0.2% system, 32.8% interrupt, 66.6% idle
>>> Mem: 188M Active, 282M Inact, 283M Wired, 22M Cache, 206M Buf, 1127M Free
>>> Swap: 4096M Total, 4096M Free
>>>
>>>   PID USERNAME    THR PRI NICE   SIZE    RES STATE   C   TIME    WCPU
>>> COMMAND
>>>  1362 root          1  20    0   150M 25596K select  1   1:18   0.10%
>>> Xorg
>>>  1613 peter         4  32    0   260M 21700K select  1   0:02   0.10%
>>> xfce4-terminal
>>>  1521 peter         1  20    0   159M 17652K select  1   0:10   0.00%
>>> xfwm4
>>>  1539 peter         1  20    0   152M 13704K select  1   0:08   0.00%
>>> wrapper
>>>  1524 peter         3  20    0   278M 24172K select  1   0:05   0.00%
>>> xfce4-panel
>>>  1444 haldaemon     2  28    0 60428K  6436K select  1   0:01   0.00%
>>> hald
>>>  1511 peter         2  39    0   163M 14756K select  1   0:01   0.00%
>>> xfce4-session
>>>  1544 root          2  20    0 54908K  5904K select  1   0:01   0.00%
>>> upowerd
>>>  1526 peter         2  20    0   247M 16108K kqread  0   0:01   0.00%
>>> xfdesktop
>>>  1540 peter         1  20    0   156M 15480K select  1   0:01   0.00%
>>> wrapper
>>>  1279 messagebus    1  20    0 17044K  3144K select  0   0:00   0.00%
>>> dbus-daemon
>>>
>>> How do I diagnose what's using my processor?
>>>
>>
>> vmstat -i
>>
>> --
>> Adam
>>
>
> Cheers Adam. That gives me:
>
> [peter 181]> vmstat -i
> interrupt                          total       rate
> irq1: atkbd0                       11870          1
> irq9: acpi0                        27499          4
> irq12: psm0                       234774         39
> irq16: uhci3                  1250818252     210292
> irq20: hpet0 uhci0               6977995       1173
> irq21: uhci1                          11          0
> irq23: ehci0                           2          0
> irq257: hdac0                      16380          2
> irq258: iwn0                      559063         93
> irq259: ahci0                     103732         17
> irq260: vgapci0                   311808         52
> Total                         1259061386     211678
>
>
> Any idea why the uhci is causing such a high interrupt rate? Is that
> normal? Sorry for being so noob.
>

You can try asking on the usb list.  It's not normal, probably the driver
isn't supported fully.  Might be a trivial change to get to work.



-- 
Adam