Ubuntu
linux package

  1. Zesty (17.04)
  2. Bug #1709889
  3. Comment #14

Comment 14 for bug 1709889

Revision history for this message
bugproxy (bugproxy) wrote : Comment bridged from LTC Bugzilla

------- Comment From <email address hidden> 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.