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Re: [Qemu-discuss] VM tuning

From: Peter Kieser
Subject: Re: [Qemu-discuss] VM tuning
Date: Fri, 04 Oct 2013 08:46:49 -0700
User-agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:17.0) Gecko/20130801 Thunderbird/17.0.8

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



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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