[CentOS] Centos 6.3: load average strangeness

Dennis Jacobfeuerborn dennisml at conversis.de
Thu Jan 17 12:09:23 UTC 2013


On 01/17/2013 12:17 PM, Dario Lesca wrote:
> Hi, on my c6.3 server (guest of a vmware host) I have a strange load
> average value:
>
> w command:
>> [root at s-doc ~]# w
>>  11:19:23 up 41 days, 23:15,  1 user,  load average: 4,03, 4,03, 4,00
>> USER     TTY      FROM              LOGIN@   IDLE   JCPU   PCPU WHAT
>> root     pts/2    dodo:S.0         11:15    0.00s  0.02s  0.00s w
> top command:
>
>> top - 12:13:31 up 42 days, 9 min,  1 user,  load average: 4.00, 4.01, 4.00
>> Tasks: 127 total,   1 running, 126 sleeping,   0 stopped,   0 zombie
>> Cpu(s):  0.0%us,  0.0%sy,  0.0%ni, 99.3%id,  0.7%wa,  0.0%hi,  0.0%si,  0.0%st
>> Mem:   1914596k total,  1783108k used,   131488k free,    86536k buffers
>> Swap:  2047992k total,    18884k used,  2029108k free,   246504k cached
>>
>>   PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND                                                           
>>   863 root      20   0     0    0    0 D  0.3  0.0  26:05.07 xfsaild/dm-5                                                           1 root      20   0 21452 1032  780 S  0.0  0.1   0:01.76 init                                                                   2 root      20   0     0    0    0 S  0.0  0.0   0:00.53 kthreadd                                                               3 root      RT   0     0    0    0 S  0.0  0.0   0:00.00 migration/0                                                            4 root      20   0     0    0    0 S  0.0  0.0   0:06.32 ksoftirqd/0                                                        
>>     5 root      RT   0     0    0    0 S  0.0  0.0   0:00.00 migration/0                                                            6 root      RT   0     0    0    0 S  0.0  0.0   0:05.66 watchdog/0                                                             7 root      20   0     0    0    0 S  0.0  0.0  27:33.90 events/0                                                               8 root      20   0     0    0    0 S  0.0  0.0   0:00.00 cgroup                                                             
>>     9 root      20   0     0    0    0 S  0.0  0.0   0:00.00 khelper                                                               10 root      20   0     0    0    0 S  0.0  0.0   0:00.00 netns                                                                 11 root      20   0     0    0    0 S  0.0  0.0   0:00.00 async/mgr                                                             12 root      20   0     0    0    0 S  0.0  0.0   0:00.00 pm                                                                    13 root      20   0     0    0    0 S  0.0  0.0   0:13.75 sync_supers                                                        
>>    14 root      20   0     0    0    0 S  0.0  0.0   0:12.35 bdi-default                                            
> But none of process still work, top have no process > 0,xx and also
> iotop value are > 0,xx.
>
> This is the vmstat output:
>
>> [root at s-doc ~]# vmstat 2 10
>> procs -----------memory---------- ---swap-- -----io---- --system-- -----cpu-----
>>  r  b   swpd   free   buff  cache   si   so    bi    bo   in   cs us sy id wa st
>>  0  0  18884 131984  86508 246500    0    0     2    10    9    9  1  0 99  0  0
>>  0  0  18884 131976  86508 246500    0    0     0     6  126  542  0  0 99  1  0
>>  0  0  18884 131976  86508 246500    0    0     0     0  126  546  0  0 100  0  0
>>  0  0  18884 131976  86508 246500    0    0     0     0  123  539  0  0 100  0  0
>>  0  0  18884 131976  86508 246500    0    0     0     0  122  538  0  0 100  0  0
>>  0  0  18884 131976  86508 246500    0    0     0     0  127  538  0  0 100  0  0
>>  0  0  18884 131844  86508 246500    0    0     0     2  166  535  5  1 95  0  0
>>  4  0  18884 131844  86508 246500    0    0     0    20  122  532  0  0 100  0  0
>>  0  0  18884 131844  86508 246500    0    0     0     0  124  538  0  0 100  0  0
>>  0  0  18884 131844  86512 246500    0    0     0    12  123  539  0  0 98  2  0
>>
> There is some method to find out what it is that causes the load average
>> 4.0 ?
> Many thanks for your reply.
>
Looks like https://bugzilla.redhat.com/show_bug.cgi?id=883905

Regards,
  Dennis



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