Re: [Qemu-discuss] VM tuning

[Peter Kieser]

Change your I/O scheduler to deadline from cfq. IBM has a KVM best 
practices guide, which outlines the differences between the schedulers:

http://pic.dhe.ibm.com/infocenter/lnxinfo/v3r0m0/index.jsp?topic=%2Fliaat%2Fliaatbpdeadline.htm

-Peter

On 2013-10-04 4:07 AM, Stephan von Krawczynski wrote:
> Hello all,
>
> I try to setup a box with 128GB and 32 cpus split into 2 numa nodes. I found
> out that while copying a large file to the host some of the qemu guests start
> choking. I guess this is because of the vm cache setup.
> The probably most important two tunables are:
>
> vm.dirty_background_ratio = 10
> vm.dirty_ratio = 20
>
> which is the ditros/kernels (3.11.2) standard setup.
> Does anybody have a better idea about these for such a setup?
> The guests mem sizes btw sum up to around half of the physical mem, the rest
> is used as cache.

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