Dominik Klein wrote: >> Hmm.. "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. > > Hm, maybe I was not clear then. Let me try to rephrase. > > As far as I understand, and as far as I saw during my tests, the blkio > controller only works for sync I/O requests (eg dd with oflag=direct). > Buffered I/O is not part of the control. Yes, you are right. > > And since a VM's I/O is most likely buffered in some fashion, this does > not have any effect. That's what my tests showed. how about the start Guest with option "cache=none" to bypass pagecache? This should help i think. > > Did your tests show something different? Maybe I did things wrong then. I think blkio cgroup should work if "cache=none" is set. But I didn't try it, Will try it later. Thanks Gui > > Regards > Dominik > -- Regards Gui Jianfeng -- libvir-list mailing list libvir-list@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/libvir-list