Updated bug description and added Bionic bug task. Marked bug 1785081
as a duplicate of this bug.
** Also affects: linux (Ubuntu Bionic)
Importance: Undecided
Status: New
** Changed in: linux (Ubuntu Bionic)
Status: New => Triaged
** Changed in: linux (Ubuntu Bionic)
But that new lp bug is sparse on details too can all comments be
pushed through on
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1785081 ?
What exactly is happening with the bionic kernel, and what is the
expectation here?
The comments in this bug report from cking still stand imho.
Dimitri, we've synced the other bug 1785081 that is probably the same
issue as this one.
F.
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https://bugs.launchpad.net/bugs/1709889
Title:
Ubuntu 17.04: Bug in cfq scheduler, I/Os do
For now reopening the states of this issue in launchpad as NEW and
UNDECIDED priority.
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Title:
Ubuntu 17.04: Bug in cfq scheduler, I/Os do not
This bug was closed in january 2018. Are you sure this is the same issue
/ right ticket? I see that you have recently marked some other bug as a
duplicate of this one. maybe you can sync that one? If not please
state what is happening on 18.04 since in january it was believed that
this issue
** Tags removed: severity-critical
** Tags added: severity-high
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Title:
Ubuntu 17.04: Bug in cfq scheduler, I/Os do not get submitted to
--- Comment From dougm...@us.ibm.com 2018-05-14 13:40 EDT---
Note, we are still seeing issues with CFQ on 18.04 (Bionic).
** Tags removed: targetmilestone-inin1704
** Tags added: targetmilestone-inin1804
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These patches are available in Artful and will be available in the
linux-hwe kernel, please upgrade to the latest linux-hwe and reopen this
bug if you are able to reproduce it. Marking it invalid for now.
** Changed in: linux (Ubuntu)
Status: In Progress => Invalid
** Changed in:
Ubuntu 17.04 has reached end of life. No further bugfixes will be
applied to this version.
** Changed in: linux (Ubuntu Zesty)
Status: In Progress => Won't Fix
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Marking as "incomplete" until fix lands upstream.
** Changed in: ubuntu-power-systems
Status: In Progress => Incomplete
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Title:
Ubuntu
** Tags removed: triage-r
** Tags added: triage-g
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Title:
Ubuntu 17.04: Bug in cfq scheduler, I/Os do not get submitted to
adapter for a very
** Tags added: triage-r
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Title:
Ubuntu 17.04: Bug in cfq scheduler, I/Os do not get submitted to
adapter for a very long time.
To manage
Thanks for also testing with the latest upstream kernel and reporting it
to the upstream developers. I've added the link to the bug so we pull in
bug updates automatically from the bugzilla.
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Doug,
"Can we get some answers as to why CFQ is the default scheduler? It
seems like the expedient fix is to change the default to "deadline"."
Sure. We went back to CFQ as it was showing to be a good general purpose
I/O scheduler for a lot of wide ranging and general purpose I/O demands.
--- Comment From dougm...@us.ibm.com 2017-08-23 09:19 EDT---
Opened kernel.org bugzilla https://bugzilla.kernel.org/show_bug.cgi?id=196737
** Bug watch added: Linux Kernel Bug Tracker #196737
https://bugzilla.kernel.org/show_bug.cgi?id=196737
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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:
** Changed in: linux (Ubuntu)
Assignee: Joseph Salisbury (jsalisbury) => Colin Ian King (colin-king)
** Changed in: linux (Ubuntu Zesty)
Assignee: Joseph Salisbury (jsalisbury) => Colin Ian King (colin-king)
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I built a 17.04(Zesty) test kernel with a pick of commit 5be6b75610ce.
This kernel can be downloaded from:
http://kernel.ubuntu.com/~jsalisbury/lp1709889/
Can you test this kernel and see if it resolves this bug?
I also see that commit 5be6b75610ce has been cc'd to upstream stable,
but it has
** Changed in: ubuntu-power-systems
Status: New => In Progress
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Title:
Ubuntu 17.04: Bug in cfq scheduler, I/Os do not get submitted to
** Changed in: linux (Ubuntu)
Status: New => In Progress
** Changed in: linux (Ubuntu)
Importance: Undecided => Critical
** Changed in: linux (Ubuntu)
Assignee: Ubuntu on IBM Power Systems Bug Triage (ubuntu-power-triage) =>
Joseph Salisbury (jsalisbury)
** Also affects: linux
** Also affects: ubuntu-power-systems
Importance: Undecided
Status: New
** Changed in: ubuntu-power-systems
Importance: Undecided => Critical
** Changed in: ubuntu-power-systems
Assignee: (unassigned) => Canonical Kernel Team (canonical-kernel-team)
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