Too many interrupts?

Dennis Muhlestein devel at muhlesteins.com
Fri Oct 3 12:18:13 MDT 2008


I installed the Fedora 10 beta on a new machine the last couple days.  
Everything seems to be working fine except I keep getting a little 
pause, lock, or freeze in the GUI every minute or two.  I ran vmstat for 
a while and found something like this:
procs -----------memory---------- ---swap-- -----io---- --system-- 
-----cpu------
 r  b   swpd   free   buff  cache   si   so    bi    bo   in   cs us sy 
id wa st
 1  0      0 6586892  41132 734272    0    0     0     0  588  911  9  2 
89  0  0
 0  0      0 6586900  41132 734272    0    0     0     0  646 1339  9  2 
89  0  0
 0  0      0 6586892  41140 734268    0    0     0   280  627  969  9  2 
88  0  0
 0  0      0 6586892  41140 734272    0    0     0     0  710 1057 11  2 
87  0  0
 0  0      0 6586892  41140 734272    0    0     0     0  519  821  7  2 
91  0  0
 0  0      0 6586768  41140 734272    0    0     0     0  686  971 11  1 
88  0  0
 0  0      0 6586892  41140 734272    0    0     0     0  705 1421 11  2 
87  0  0
 1  0      0 6586668  41140 734272    0    0     0     0 1278  868 28  2 
70  0  0
---- lock in gui ---
 1  0      0 6586596  41148 734272    0    0     0   292 2131  189 50  1 
50  0  0
 1  0      0 6586596  41148 734272    0    0     0     0 2125  153 50  0 
50  0  0
 1  0      0 6586596  41148 734272    0    0     0     0 2127  163 50  0 
50  0  0
 0  0      0 6586776  41148 734272    0    0     0     0 1153 1636 23  2 
76  0  0
 1  0      0 6586892  41148 734272    0    0     0     0  472 1134  6  2 
92  0  0
 0  0      0 6586768  41148 734272    0    0     0     0  917 2538 15  4 
81  0  0
 0  0      0 6586768  41148 734272    0    0     0     0  297  604  2  1 
97  0  0
 0  0      0 6586768  41148 734272    0    0     0     0  281  543  2  1 
96  0  0

I noticed that every time I get a gui lock, the number of system in 
(interrupts) jumps from the usual mid-100s to the 2100s.

1) Anyone have any idea what could be causing this?
2) Anyone know of a way to find out where extra interrups are being 
generated or if an interrupt handler is taking too long?

-Thanks



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