------- Comment From dougm...@us.ibm.com 2017-08-18 07:51 EDT------- Test results with the binary kernel package show the same symptoms, I/Os getting delayed longer than 10 minutes. It seems that those three patches together cause a regression of the "cfq-iosched: fix the delay of cfq_group's vdisktime under iops mode" patch.
So, in summary, with *only* the patch: 5be6b75610cefd1e21b98a218211922c2feb6e08 "cfq-iosched: fix the delay of cfq_group's vdisktime under iops mode" I see some improvement of the I/Os delays, although the delays are still too long. But by adding these two patches: 4d608baac5f4e72b033a122b2d6d9499532c3afc "block: Initialize cfqq->ioprio_class in cfq_get_queue()" 142bbdfccc8b3e9f7342f2ce8422e76a3b45beae "cfq: Disable writeback throttling by default" I see a regression of the delays back to what I was seeing without any patches. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1709889 Title: Ubuntu 17.04: Bug in cfq scheduler, I/Os do not get submitted to adapter for a very long time. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-power-systems/+bug/1709889/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
