Interrupt using all the CPU

Nikos Vassiliadis nvass at teledomenet.gr
Tue Jul 4 11:23:42 UTC 2006


On Tuesday 04 July 2006 13:10, nocturnal wrote:
> Hi
>
> The -m argument exists in 5.3-RELEASE, thank you. I've attached one file
> with -mio and the other without. With -mio it just output some extra
> stuff at the beginning so i don't know how much it matters or maybe i
> did something wrong.

I see nothing backing up those numbers...

You said it doesn't seem to affect the web server, That everything
feels normal. You cannot feel the load using the box, typing, etc, right?
In cases where interrupts reach 25%, the load is very easily noticable,
that means you have trouble typing...I would say that such a percentage
(100%) is false, you wouldn't be able to log in to the box, the kernel itself 
would have trouble doing something, but interrupt handling.

A wild guess would be that you hit a bug. After all 5.3-RELEASE was the
first release marked STABLE from the 5 branch.

>
>
>
> Med vänliga hälsningar
>
> Stefan Midjich aka nocturnal
> [Swehack] http://swehack.se
>
> Nikos Vassiliadis wrote:
> > On Tuesday 04 July 2006 11:40, nocturnal wrote:
> >> Hi
> >>
> >> This is what i get, i'm afraid i'm not good at interpreting the results.
> >>
> >>   procs      memory      page                    disks     faults     
> >> cpu r b w     avm    fre  flt  re  pi  po  fr  sr ad4 ad6   in   sy  cs
> >> us sy id
> >>   1 5 0  274324  36436   26   0   0   0  50  27   0   0  242  149 332  0
> >> 88 12
> >>   1 5 0  274324  36424    3   0   0   0   3   0   1   0  338  911 462  0
> >> 50 50
> >>   1 5 0  274324  36424    0   0   0   0   0   0  16   0  391 1011 581  0
> >> 33 67
> >>   1 5 0  274324  36424    0   0   0   0   3   0   1   0  611  263 877  0
> >> 33 67
> >>   1 5 0  274324  36424    0   0   0   0   0   0   1   0  674  128 931  0
> >> 75 25
> >>   1 5 0  274324  36424    0   0   0   0   0   0   0   0  563  118 711  0
> >>   0 100
> >>   1 5 0  274324  36424    0   0   0   0   0   0   0   0  531  129 702  0
> >> 67 33
> >>   1 5 0  274324  36424    0   0   0   0   0   0   0   0  440  118 578  0
> >> 50 50
> >>   1 6 0  274324  36376    0   0   0   0   0   0   0   0  563  158 774  0
> >> 67 33
> >>   1 5 0  274324  36268    0   0   0   0   0   0  10   0  702 1019 920  0
> >> 100  0
> >>   1 5 0  274324  36268    0   0   0   0   0   0   0   0  683  118 872  0
> >> 25 75
> >>   0 6 0  291460  33800  955   0   0   0 333   0   0   0  783 1423 1069
> >> 0 50 50
> >>   0 5 0  274324  36240  611   0   0   0 1500   0   0   0  491  567 707
> >> 0 100  0
> >>   0 5 0  274324  36240    0   0   0   0   0   0   0   0  717  121 986  0
> >> 100  0
> >>   0 5 0  274324  36240    0   0   0   0   0   0   0   0  729  129 923  0
> >> 33 67
> >>   0 5 0  274324  36240    0   0   0   0   0   0   0   0  570  118 742  0
> >> 50 50
> >>   0 5 0  274324  36240    0   0   0   0   0   0   0   0  568 1381 793  0
> >> 33 67
> >>   0 5 0  274324  36240    0   0   0   0   4   0  32   0  716  129 1036
> >> 0 75 25
> >>   0 5 0  274324  36240    0   0   0   0   0   0   0   0  745  118 843  0
> >> 75 25
> >>   0 5 0  274324  36240    0   0   0   0   0   0   7   0  610  137 820  0
> >> 67 33
> >>   0 5 0  274324  36240    0   0   0   0   0   0   0   0  465  174 630  0
> >>   0 100
> >>   0 5 0  274324  36240    0   0   0   0   0   0   0   0  327  237 454  0
> >> 50 50
> >>   0 5 0  274324  36240    0   0   0   0   0   0   0   0  253  125 323  0
> >> 100  0
> >>   0 5 0  274324  36240    0   0   0   0   0   0   0   0  249  127 314  0
> >> 100  0
> >>   0 5 0  274324  36240    0   0   0   0   0   0   0   0  240  118 303  0
> >> 100  0
> >>   0 5 0  274324  36240    0   0   0   0   0   0   0   0  238  125 301  0
> >> 100  0
> >>   0 5 0  274324  36240    0   0   0   0   0   0   0   0  255  129 330  0
> >> 100  0
> >>   0 5 0  274324  36240    0   0   0   0   0   0   0   0  258  144 337  0
> >> 100  0
> >>   0 5 0  274324  36240    0   0   0   0   0   0   0   0  269  129 358  0
> >> 100  0
> >>   0 5 0  274324  36236    0   0   0   0   0   0   2   0  312  527 431  0
> >> 100  0
> >>   0 5 0  274324  36236    0   0   0   0  12   0  21   0  287  129 409  0
> >> 100  0
> >>   0 5 0  274324  36236    0   0   0   0   0   0   0   0  257  128 331  0
> >> 100  0
> >>   0 5 0  274324  36236    0   0   0   0   0   0   0   0  253  118 324  0
> >> 100  0
> >>   0 5 0  274324  36236    0   0   0   0   0   0   0   0  248  128 315  0
> >> 100  0
> >>   0 5 0  274324  36236    0   0   0   0   0   0   5   0  257  118 333  0
> >> 100  0
> >>   0 5 0  274324  36236    0   0   0   0   0   0   0   0  257  118 327  0
> >> 100  0
> >>   0 5 0  274324  36236    0   0   0   0   0   0   0   0  294  118 366  0
> >> 100  0
> >
> > Please turn off word wrapping on your mail program when
> > you send such output. Or send as attachment. Well, normal
> > number of interrupts, a lot of time in kernel, quite a few context
> > switches
> >
> > send as attachment  "top -n -S -I -d 10" please
> > There is also a -m in 6.x, don't know about 5.3-R, but it would be
> > interesting if it exists
> >
> > from top manual:
> >        -mdisplay
> >               Display either cpu or io statistics.  Default is cpu.


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