Vivek Goyal wrote: >> Hi Vivek, >> >> I would be interested in knowing if these are the results expected? >> > > Hi Dhaval, > > Good question. Keeping current expectation in mind, yes these are expected > results. To begin with, current expectations are that try to emulate > cfq behavior and the kind of service differentiation we get between > threads of different priority, same kind of service differentiation we > should get from different cgroups. > > Having said that, in theory a more accurate estimate should be amount > of actual disk time a queue/cgroup got. I have put a tracing message > to keep track of total service received by a queue. If you run "blktrace" > then you can see that. Ideally, total service received by two threads > over a period of time should be in same proportion as their cgroup > weights. > > It will not be easy to achive it given the constraints we have got in > terms of how to accurately we can account for disk time actually used by a > queue in certain situations. So to begin with I am targetting that > try to meet same kind of service differentation between cgroups as > cfq provides between threads and then slowly refine it to see how > close one can come to get accurate numbers in terms of "total_serivce" > received by each queue. Hi Vivek, I simply tested with blktrace opened. I create two groups and set ioprio 4 and 7 respectively(the corresponding weight should 4:1, right?), and start two dd concurrently. UUIC, Ideally, the proportion of service two dd got should be 4:1 in a period of time when they are running. I extract *served* value from blktrace output and sum them up. I found the proportion of the sum of *served* value is about 1.7:1 Am i missing something? I extract the following highlight value 8,0 0 0 18.914906549 0 m N 6601ioq served=*0x13* total service=0x184d > > Thanks > Vivek > > > -- Regards Gui Jianfeng _______________________________________________ Containers mailing list Containers@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/containers
