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Ubuntu 10.04 64bit - Kernel 2.6.36 Running as a Xen 3.4 guest.

8GB memory , no swap being used, no IO wait time, and 0% cpu. Yet high load. Why is this:

15:11:24 up 5 days, 3:22, 2 users, load average: 21.23, 20.06, 19.51 Tasks: 113 total, 1 running, 112 sleeping, 0 stopped, 0 zombie Cpu(s): 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st Mem: 7416372k total, 5250472k used, 2165900k free, 153260k buffers Swap: 1959924k total, 26288k used, 1933636k free, 246932k cached

IO top shows nothing.

free -mem

 total used free shared buffers cached Mem: 7242 5127 2115 0 149 241 -/+ buffers/cache: 4736 2506 Swap: 1913 25 1888
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  • Presumably you have a lot of threads/processes waiting for I/O that's not happening. Networked filesystems can do this. Commented Sep 24, 2012 at 19:39
  • Have you got 4 CPUs? Commented Sep 24, 2012 at 20:51
  • Dual Xeon - 8 threads. Commented Sep 24, 2012 at 21:06

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You either 1) own the host or 2) you are renting it from a hosting company.

If it's 1 then you should look at the other machines on the host, find out which one is thrashing the disks and fix it.

If it's 2 you need to complain to your hosting company and see if they can't either move you or move the offending party to another physical box and/or data store.

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  • If 1 then there should be wait time. If 2 there should be stolen time. Commented Sep 24, 2012 at 20:53
  • It's on a 'bare-metal' Xen guest. Hosted with a provider. they say the physical hardware isn't shared. It's just under a Xen host to be able to launch/re seize, etc easily. Commented Sep 24, 2012 at 21:08

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