On Fri, Feb 18, 2011 at 04:12:28PM +0800, Gui Jianfeng wrote: > "blkio.weight" is used to control the Minimal Maximal Bandwidth. If you'd like > to control Max bandwidth to let your guests become I/O hungery. "blkio.throttle.*" > should helps. But these tunables aren't supported by blkiotune for the time being. > I'm considering to implement them in the future. I'm still a bit confused. The "weight" controls the 'percentage' of resources the VM gets compared to other VMs (or other processes participating in the cgroup)? If I have 5 processes running on the system, and 4 of them are VMs using cgroups, then the VMs get 4/5s of all CPU time for IO tasks, and each VM gets an amount of that 4/5th proportional to it's weight? Yes? Then, blkio.throttle can be used to set actual hard limits on IO consumption -- like, no more than 10Mbps for this VM. I can already do this with blkio cgroups, but just not from libvirt -- yes? Like many people using libvirt, I only use my hosts for running VMs, and I am most interested in limiting IO operations per host to make sure that no host monopolizes our SAN. Is there a way for me to just set a hard IO throttle limit for libvirt as a whole which would apply to all child VMs created by libvirt? I saw a discussion on this list regarding group hierarchy, but it went over my head. --Igor
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