High %sy cpu usage , server is very slow

[Aravind M D]

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=/dev/cciss/c0d0p2
isize=256 agcount=16, agsize=163787 blks
 = sectsz=512 attr=1
data =
bsize=4096 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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