IRQ storm

[Erik Trulsson]

On Sat, Mar 24, 2007 at 07:35:43PM -0400, alex at schnarff.com wrote:
> >>I've changed motherboard recently (now it is Intel DP965LT) and now I
> >>have my PC slowed down considerably. vmstat -i shows a huge amount of
> >>interrupts on irq17: atapci0:
> >
> >Do you have atapicam enabled or being loaded as a module? If so, I
> >have the same problem, which is currently being tracked in this PR:
> >
> >http://www.freebsd.org/cgi/query-pr.cgi?pr=103602
> >
> >A workaround, if you don't need/want to burn cds/dvds is to remove
> >atapicam or don't load the module at boot time.
> >
> >Thanks,
> >Josh
> 
> OK, I know it's probably bad form to reply to a message with a 
> question...but I saw this, ran vmstat -i, and found what appears to be 
> a huge number of interrupts going on:
> 
> alex at tms: /usr/local/www/data-dist/arctic$ vmstat -i
> interrupt                          total       rate
> irq1: atkbd0                         422          0
> irq6: fdc0                            10          0
> irq8: rtc                      241113447        127
> irq12: psm0                            9          0
> irq13: npx0                            1          0
> irq14: ata0                           46          0
> irq19: atapci1                  11758285          6
> irq21: fxp0                     16485189          8
> irq22: ahc0                      3623514          1
> irq0: clk                      188371666         99
> Total                          461352589        244


The 'rate' column is the average number of interrupts per second since the
system started.  None of those look particularly large.  In fact they look
extremely ordinary and unremarkable in all ways. 




-- 
<Insert your favourite quote here.>
Erik Trulsson
ertr1013 at student.uu.se