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[Qemu-discuss] VM tuning

From: Stephan von Krawczynski
Subject: [Qemu-discuss] VM tuning
Date: Fri, 4 Oct 2013 13:07:08 +0200

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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