[Xen-users] 99% iowait on one core in 8 core processor

[Rajesh Kumar <rajesh@xxxxxxxx>]

Hi All,

We have a xen server and using 8 core processor.

I can see that there is 99% iowait on only  core 0.


02:28:49 AM  CPU   %user   %nice    %sys %iowait    %irq   %soft  %steal   
%idle    intr/s
02:28:54 AM  all    0.00    0.00    0.00   12.65    0.00    0.02    2.24   
85.08   1359.88
02:28:54 AM    0    0.00    0.00    0.00   96.21    0.00    0.20    3.19    
0.40    847.11
02:28:54 AM    1    0.00    0.00    0.00    6.41    0.00    0.00    9.42   
84.17    219.56
02:28:54 AM    2    0.00    0.00    0.00    0.00    0.00    0.00    0.00  
100.00      2.59
02:28:54 AM    3    0.00    0.00    0.00    0.00    0.00    0.00    2.12   
97.88     76.25
02:28:54 AM    4    0.00    0.00    0.00    0.00    0.00    0.00    1.20   
98.80    118.56
02:28:54 AM    5    0.00    0.00    0.00    0.00    0.00    0.00    0.00  
100.00      3.59
02:28:54 AM    6    0.00    0.00    0.00    0.00    0.00    0.00    2.02   
97.98     89.62
02:28:54 AM    7    0.00    0.00    0.00    0.00    0.00    0.00    0.20   
99.80      2.59

02:28:54 AM  CPU   %user   %nice    %sys %iowait    %irq   %soft  %steal   
%idle    intr/s
02:28:59 AM  all    0.00    0.00    0.00   12.48    0.00    0.00    2.78   
84.74   1317.43
02:28:59 AM    0    0.00    0.00    0.00   98.80    0.00    0.00    0.80    
0.40    885.17
02:28:59 AM    1    0.00    0.00    0.00    0.00    0.00    0.00   11.38   
88.62    151.30
02:28:59 AM    2    0.00    0.00    0.00    0.00    0.00    0.00    0.20   
99.80      2.81
02:28:59 AM    3    0.00    0.00    0.00    0.00    0.00    0.00    7.21   
92.79     94.79
02:28:59 AM    4    0.00    0.00    0.00    0.00    0.00    0.00    2.20   
97.80    170.34
02:28:59 AM    5    0.00    0.00    0.00    0.00    0.00    0.00    0.00  
100.00      4.41
02:28:59 AM    6    0.00    0.00    0.00    0.00    0.00    0.00    0.00  
100.00      5.81
02:28:59 AM    7    0.00    0.00    0.00    0.00    0.00    0.00    0.00  
100.00      2.81


I have even tries changing the cpus mapped to the DomU with out no effect.

Name                              CPU  CPU Affinity
4pulse                              1           1
2music                             3            3
Domain-0                        0               0
Domain-0                        1               1
Domain-0                        2               2
Domain-0                        3               3
Domain-0                        4               4
Domain-0                        5               5
Domain-0                        6               6
Domain-0                        7               7
analshah                         6              any cpu
arunvelayudhan            7             any cpu
backup                            7             any cpu
crickruns                         3             1-3
crickruns                         2             1-3
crickruns                         1             1-3
crickruns                         2             1-3
crickruns                         1             1-3
crickruns                         1             1-3
dedicatedjv                     7               any cpu
yeluthu                             4           3-5
yeluthu                             3           3-5
yeluthu                             3           3-5
yeluthu                             3           3-5
yeluthu                             3           3-5
yeluthu                             3           3-5
freshnfresh                      3              any cpu
monitoring                       7              any cpu
reporter                                  6             5-7
reporter                          7             5-7
reporter                          6             5-7
reporter                          6             5-7
reporter                          7             5-7
reporter                                  7             5-7
reporter                          5             5-7
reporter                          7             5-7
radio03                            7            any cpu
saampeter                       2               1-2
saampeter                       2               1-2


Thanks,
Rajesh
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