On 25-Jul-2019 10:30:03 PM, Aaron Lu wrote: > > I tried a different approach based on vruntime with 3 patches following. [...]
We have experimented with this new patchset and indeed the fairness is now much better. Interactive tasks with v3 were complete starving when there were cpu-intensive tasks running, now they can run consistently. With my initial test of TPC-C running in large VMs with a lot of background noise VMs, the results are pretty similar to v3, I will run more thorough tests and report the results back here. Instead of the 3/3 hack patch, we were already working on a different approach to solve the same problem. What we have done so far is create a very low priority per-cpu coresched_idle kernel thread that we use instead of idle when we can't co-schedule tasks. This gives us more control and accounting. It still needs some work, but the initial results are encouraging, I will post more when we have something that works well. Thanks, Julien
