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High %sy cpu usage , server is very slow

To: <xfs@xxxxxxxxxxx>
Subject: High %sy cpu usage , server is very slow
From: Aravind M D <aravind@xxxxxxxx>
Date: Mon, 08 Jun 2015 11:33:21 +0530
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HI,

On one of the server we are noticing high %sy usage due to which server is very slow. We have configured one of file system with xfs which is used to store mail queue.

Below is the iostat output on one of the instance when there is high %sy usage

avg-cpu: %user %nice %system %iowait %steal %idle

           0.01    0.00   48.26    0.01    0.00   51.73

Device:         rrqm/s   wrqm/s   r/s   w/s    rkB/s    wkB/s avgrq-sz avgqu-sz   await  svctm  %util
cciss/c0d0        0.00    16.99  0.00  8.36     0.00   414.90    99.30     0.77   92.57  46.30  38.69
cciss/c0d0p1      0.00     0.00  0.00  0.00     0.00     0.00     0.00     0.00    0.00   0.00   0.00
cciss/c0d0p2      0.00     0.00  0.00  6.13     0.00   338.02   110.32     0.77  126.18  63.09  38.66
cciss/c0d0p3      0.00     0.28  0.00  0.84     0.00     4.46    10.67     0.00    0.33   0.33   0.03
cciss/c0d0p4      0.00     0.00  0.00  0.00     0.00     0.00     0.00     0.00    0.00   0.00   0.00
cciss/c0d0p5      0.00     0.56  0.00  0.28     0.00     3.34    24.00     0.00    0.00   0.00   0.00
cciss/c0d0p6      0.00     0.00  0.00  0.00     0.00     0.00     0.00     0.00    0.00   0.00   0.00
cciss/c0d0p7      0.00    11.42  0.00  0.56     0.00    47.91   172.00     0.00    0.00   0.00   0.00
cciss/c0d0p8      0.00     4.74  0.00  0.56     0.00    21.17    76.00     0.00    0.00   0.00   0.00

~]# xfs_info /dev/cciss/c0d0p2
meta-data=""      isize=256    agcount=16, agsize=163787 blks
         =                       sectsz=512   attr=1
data     =                       ""   blocks=2620592, imaxpct=25
         =                       sunit=0      swidth=0 blks, unwritten=1
naming   =version 2              bsize=4096
log      =internal               bsize=4096   blocks=2560, version=1
         =                       sectsz=512   sunit=0 blks, lazy-count=0
realtime =none                   extsz=4096   blocks=0, rtextents=0

Are we facing any performance issue with xfs. Please let me know

-- 
Regards, Aravind M D
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