[CentOS-virt] steadily increasing/high loadavg without i/o wait or cpu utilization
Günter Zimmermann
guenter.zimmermann at gmx.at
Fri Nov 20 08:13:18 UTC 2009
Hi all,
I just installed centos 5.4 xen-kernel on intel core i5 machine as dom0.
After some hours of syncing a raid10 array (8 sata disk) I noticed a
steadily increasing loadavg. I think without reasonable i/o wait or cpu
utilization the loadavg on this system should be very lower. If this
loadavg is normal I would be greatful if somone could explain why. The
screenshots below show that there is neither much i/o wait nor much cpu
utilization.
top - 09:10:25 up 9:26, 1 user, load average: 7.24, 7.63, 7.72
Tasks: 116 total, 4 running, 112 sleeping, 0 stopped, 0 zombie
Cpu0 : 0.0%us, 42.5%sy, 0.0%ni, 57.5%id, 0.0%wa, 0.0%hi, 0.0%si,
0.0%st
Cpu1 : 0.0%us, 1.3%sy, 0.0%ni, 97.7%id, 0.0%wa, 0.0%hi, 0.0%si,
1.0%st
Cpu2 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si,
0.0%st
Cpu3 : 0.0%us, 10.0%sy, 0.0%ni, 89.0%id, 0.0%wa, 0.0%hi, 0.0%si,
1.0%st
Mem: 7805952k total, 809612k used, 6996340k free, 112092k buffers
Swap: 0k total, 0k used, 0k free, 341304k cached
[root at vserver ~]# iostat -d -x sda sdb sdc sdd sde sdf sg sdh
Linux 2.6.18-164.6.1.el5xen (vserver.zimmermann.com) 20.11.2009
Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s avgrq-sz
avgqu-sz await svctm %util
sda 1364,57 0,66 1820,12 0,89 25477,44 12,37
14,00 1,11 0,61 0,41 75,10
sdb 1167,12 0,68 2017,45 0,89 25476,53 12,47
12,63 1,16 0,57 0,39 79,49
sdc 1308,06 0,66 1876,65 0,91 25477,64 12,50
13,58 1,14 0,61 0,42 78,73
sdd 1267,27 0,66 1917,28 0,92 25476,32 12,57
13,29 1,09 0,57 0,42 80,16
sde 1146,76 0,63 2037,99 0,87 25477,94 11,96
12,50 0,98 0,48 0,31 63,80
sdf 1126,88 0,64 2057,62 0,87 25475,99 12,02
12,38 1,08 0,52 0,34 69,89
sdh 472,21 0,66 2712,31 0,92 25476,13 12,43
9,39 0,66 0,24 0,15 41,03
[root at vserver ~]# cat /proc/loadavg
7.22 7.58 7.69 8/129 23348
Best regards,
Günter Zimmermann
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