On 30 Dec 2017 at 11:52, Thorsten Schöning wrote:

> That's the main difference, the VM where I have the problems has 48 GB
> of RAM and currently 10 assigned vCPUs, formerly 6. The VMs where this
> is not happening have only 2 vCPUs and 6 or 8 GB of RAM, where only 2-4
> GB are in use by apps and else is cache. The problematic VM has ~10 GB
> in use by apps and everything else for caches and buffers. 


> The only thing that really jumps out is the number of context switches
> in the host and how long this happens. On the working host those climb
> from ~6'500 to 10-15'000 for very few seconds, while on the
> "non-working" host those climb from ~5'000 to 50'000 for a much longer
> period of time. While in all cases the VMs itself don't have many
> context switches themselfs. 

Could it be that your are oversubscribing your vCPUs? I mean if you assign more 
vCPUs to 
your VMs than you physically have then I guess it's expected to see lots of 
context switches 
on the host, and that would not good of course.

HTH,
Pierre
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