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[Qemu-discuss] cgroup blkio weight has no effect on qemu

From: 陈博
Subject: [Qemu-discuss] cgroup blkio weight has no effect on qemu
Date: Tue, 19 Jan 2016 19:31:11 +0800

Hi folks,

Could you enlighten me about how to achieve proportional IO sharing by using 
cgroup, instead of qemu?

My qemu config is like: -drive 
file=$DISKFILe,if=none,format=qcow2,cache=none,aio=native -device 

Test command inside vm is like: dd if=/dev/vdc of=/dev/null iflag=direct

Cgroup blkio weight of the qemu process is properly configured as well.

But no matter how change the proportion, such as vm1=400 and vm2=100, I can 
only get the equal IO speed.

Wondering cgroup blkio.weight or blkio.weight_device has no effect on qemu???

PS. cache=writethrough aio=threads is also tested, the same results. 

- Bob

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