qemu-system-x86 constantly using 20% cpu on OE VM even when not in use


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Hi all,

 

I'm using the OE VM and have noticed that "qemu-system-x86" seems to use 20% of the cpu when the VM is running.  This is even when the VM is not in use.  Is this anything to be concerned about?

 

top - 11:17:44 up  1:23,  1 user,  load average: 0.49, 0.57, 2.55

Tasks: 230 total,  1 running, 229 sleeping,  0 stopped,  0 zombie

Cpu(s):  2.9%us,  0.7%sy,  0.0%ni, 96.4%id,  0.0%wa,  0.0%hi,  0.0%si,  0.0%st

Mem:  32977464k total, 31989720k used,  987744k free,  204180k buffers

Swap:        0k total,        0k used,        0k free, 26279728k cached

 

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND

11610 root      20  0 5140m 4.2g  17m S  21 13.2  0:22.50 qemu-system-x86

3702 nobody    20  0 1240m 189m  35m S    2  0.6  1:38.43 mono

 

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Hi all,

 

I'm using the OE VM and have noticed that "qemu-system-x86" seems to use 20% of the cpu when the VM is running.  This is even when the VM is not in use.  Is this anything to be concerned about?

 

top - 11:17:44 up  1:23,  1 user,  load average: 0.49, 0.57, 2.55

Tasks: 230 total,  1 running, 229 sleeping,  0 stopped,  0 zombie

Cpu(s):  2.9%us,  0.7%sy,  0.0%ni, 96.4%id,  0.0%wa,  0.0%hi,  0.0%si,  0.0%st

Mem:  32977464k total, 31989720k used,  987744k free,  204180k buffers

Swap:        0k total,        0k used,        0k free, 26279728k cached

 

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND

11610 root      20  0 5140m 4.2g  17m S  21 13.2  0:22.50 qemu-system-x86

3702 nobody    20  0 1240m 189m  35m S    2  0.6  1:38.43 mono

 

Well, is it causing a problem?  Hard to gauge what's low vs. high usage because everyone's hardware is different and their load is different.  Unless you're having a problem, I wouldn't worry about it.

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Hi Jon,

 

well being in the UK energy is pretty expensive, so wasting it isn't high on my priority list  :)

 

The 20% cpu use is when no-one is using the system at all, i.e. NO LOAD.  It just sits there using 20% cpu constantly, which doesn't seem right to me?

 

How many CPU cores do you have allocated to the VM?

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Hi Jon,

 

well being in the UK energy is pretty expensive, so wasting it isn't high on my priority list  :)

 

The 20% cpu use is when no-one is using the system at all, i.e. NO LOAD.  It just sits there using 20% cpu constantly, which doesn't seem right to me?

 

How many CPU cores do you have allocated to the VM?

 

2

If you lower to 1, how does this impact performance for you / CPU usage?

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Hi Jon,

 

well being in the UK energy is pretty expensive, so wasting it isn't high on my priority list  :)

 

The 20% cpu use is when no-one is using the system at all, i.e. NO LOAD.  It just sits there using 20% cpu constantly, which doesn't seem right to me?

 

How many CPU cores do you have allocated to the VM?

 

2

If you lower to 1, how does this impact performance for you / CPU usage?

 

Lowering to one, TOP shows the cpu use sitting at 15% constantly.  So is it pretty much maxing out whatever cpu it is given, even when not being used?

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Yeah its the openelec VM.

 

Jon, did i read somewhere that hardware acceleration is disabled for AMD cards in this VM?  Could that be the cause of the cpu usage?  i.e its simply displaying the Kodi interface that uses all of the CPU?

 

Could be.  It's really hard to troubleshoot this right now because OE is still in beta (I'm honestly a little shocked it's taking them this long to get to 6.0 final, but I know that's probably pot calling kettle black there ;-).  If you have an NVIDIA GPU around, you could try a quick swap to see if it has an impact.

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