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CPU utlization high due to high nwk_lg domain

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Category:
ontap-9
Specialty:
Perf
Last Updated:

Applies to

ONTAP 9 

Issue

  • CPU utilization high

Example:

cluster::*> run -node node1 sysstat 1                                    
 CPU     NFS    CIFS    HTTP     Net   kB/s    Disk   kB/s    Tape   kB/s  Cache
                                  in    out    read  write    read  write    age
53%    5324   48229       0   38327   6833  127216 390644       0      0     6s
64%    6208   38916       0   64143  10034  419764 1445352       0      0     6s
50%   26610   51969       0   73790   8921  119760 382280       0      0     6s
53%   29072   57445       0  125694  10797  106164 408976       0      0     6s
89%   15387   45833       0  120733   8356  176208 521896       0      0    10s
99%   15003   48234       0  131641   7639  190944 511900       0      0     2
 99%   12012   64723       0  105238  16576  373572 512840       0      0     0s
99%   15154   35868       0  148367  13014  255076 405512       0      0     2
 99%   12834   34674       0  115071   6865  215028 550032       0      0     2
 99%   12465   32334       0  133452  17632  414064 679288       0      0     2
 99%   13036   37854       0  126981   8369  204972 402760       0      0     3
 CPU     NFS    CIFS    HTTP     Net   kB/s    Disk   kB/s    Tape   kB/s  Cache
                                  in    out    read  write    read  write    age
99%   13897   33801       0  141796   3869  104280 335868       0      0     2
 99%   12403   30245       0   87923   9940  319380 821176       0      0     2s
99%   10065   29574       0  172745   8461  158264 417404       0      0     2s
99%   11967   33489       0  154454   9136  206668 564908       0      0     3
 99%   11428   34399       0   81521   3313  136904 391944       0      0     2

  • CPU utilization high with high nwk_lg domain.

cluster::> node run -node <node_name>
node> priv set diag
node*> sysstat -M

 

Example:

sysstat-M.jpg

  • a huge amount of fragments received  from output of  "netstat -s".

Example:

> ip:
>             645136792449 total packets received                     
>             154113333490 fragments received                           <<< Here>>>
>             7271533072 packets reassembled ok                      
>             464498769419 packets sent from this host           
>             801059272 output datagrams fragmented                           
>             13545054029 fragments created                                              
> icmp:
>             Output histogram:
>                             echo reply: 19561080
>                             destination unreachable: 273761                               
>             Input histogram:
>                             echo reply: 5331332
>                             destination unreachable: 708
>                             echo: 19561716
>                             time exceeded: 8556                

  • NFS over UDP.

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