** Tags added: cscc
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https://bugs.launchpad.net/bugs/1709889
Title:
Ubuntu 18.04: Bug in cfq scheduler, I/Os do not get submitted to
adapter for a very long time.
To manage
The fixes identified here are available in Bionic:
5be6b75610ce cfq-iosched: fix the delay of cfq_group's vdisktime under iops mode
142bbdfccc8b cfq: Disable writeback throttling by default
marking this bug as fix-released. Please retest with latest Bionic
kernel and reopen this bug if this is
** Changed in: ubuntu-power-systems
Status: Triaged => Incomplete
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Title:
Ubuntu 18.04: Bug in cfq scheduler, I/Os do not get submitted
Hi all,
bug #1785081 was not mirrored completely for some reason and I'm working
on fixing this : it's just about the bug happening on 18.04 specifically
kernel 4.15.0-26. Sorry for the lag.
Also, on ppc64el, RHEL 7.5 with a 4.14 kernel uses deadline, so I guess it's
not a completely unsafe
I discussed some background with the Kernel Developers today.
Due to that I sanitized the description a bit to make it clear in the first few
lines that this is not only a 4.10 kernel issue.
On a side note I had to smile as there is LTC LTC22393 (long ago) that had Suse
switch to deadline on
** Description changed:
---Problem Description---
When running stress test, sometimes seeing IO hung in dmesg or seeing "Host
adapter abort request" error.
-
+
---Steps to Reproduce---
- There are two ways to re-create the issues:
+ There are two ways to re-create the issues:
After discussion with Michael Ranweiler, moving to medium.
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https://bugs.launchpad.net/bugs/1709889
Title:
Ubuntu 18.04: Bug in cfq scheduler, I/Os do not get submitted to
adapter
** Changed in: ubuntu-power-systems
Importance: Critical => Medium
** Changed in: linux (Ubuntu)
Importance: Critical => Medium
** Changed in: linux (Ubuntu Zesty)
Importance: Critical => Medium
** Changed in: linux (Ubuntu Bionic)
Importance: Critical => Medium
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You received
Is this behaviour also seen with a vanilla upstream 4.15 kernel, or is
it unique to the Ubuntu 4.15 bionic kernel?
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https://bugs.launchpad.net/bugs/1709889
Title:
Ubuntu 18.04: Bug in
** Changed in: ubuntu-power-systems
Importance: Undecided => Critical
** Changed in: linux (Ubuntu)
Importance: Undecided => Critical
** Changed in: ubuntu-power-systems
Status: New => Triaged
** Changed in: linux (Ubuntu)
Assignee: (unassigned) => Canonical Kernel Team
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