Ubuntu
linux package

  1. Bionic (18.04)
  2. Bug #1709889
  3. Comment #7

Comment 7 for bug 1709889

Revision history for this message
Colin Ian King (colin-king) wrote : Re: Ubuntu 17.04: Bug in cfq scheduler, I/Os do not get submitted to adapter for a very long time.

I've rolled three patches into a test kernel to test. I believe the best fix is probably "cfq: Disable writeback throttling by default" https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=142bbdfccc8b3e9f7342f2ce8422e76a3b45beae

The commits are:
4d608baac5f4e72b033a122b2d6d9499532c3afc "block: Initialize cfqq->ioprio_class in cfq_get_queue()"
142bbdfccc8b3e9f7342f2ce8422e76a3b45beae "cfq: Disable writeback throttling by default"
5be6b75610cefd1e21b98a218211922c2feb6e08 "cfq-iosched: fix the delay of cfq_group's vdisktime under
 iops mode"

You can download the packages from:
http://kernel.ubuntu.com/~cking/lp1709889/

Let me know if this helps with the issue.