This bug is also affecting us. We're on Xenial but use this kernel for
HWE. Basically for our monitoring, the leader to all this shows as dirty
memory and or filesystem writeback.
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I have also been running 4.15.0-144-generic for three weeks so far
without the issue occurring.
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https://bugs.launchpad.net/bugs/1928744
Title:
Disk IO very slow on kernel
John - thanks for finding ==>
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1926081
There is a great testing work done there.
For this thread I have been running kernel 4.15.0-144-generic for the
last 3 weeks and haven't seen the issue.
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I note it is possible this is a duplicate of
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1926081
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https://bugs.launchpad.net/bugs/1928744
Title:
Disk IO very slow on kernel
We were directed to this bug by our Portworx support team, and believe
we're seeing the same thing.
We are running Ubuntu 16.04 with the hardware enablement kernel. Most
of our nodes are running 4.15.0-140, and like Peter notes above, the I/O
performance problem does not show up right away, but
Hi!
We are running some large (100+) kubernetes clusters on bare metal
machines also running a LSI MegaRAID controller and we are experiencing
these exact problems since about a week (cluster being in production
since early june).
We run with this controller:
# lspci | grep -i mega
59:00.0 RAID
Hey,
We experienced the performance issue on different hardware servers:
LENOVO System x3650 M5
Lenovo ThinkSystem SR650
with the following kernels:
4.15.0-137-generic: disk performance issue
4.15.0-139-generic: disk performance issue
4.15.0-140-generic: disk performance issue
Hi,
We think we are affected by the same bug.
We were on version 4.15.0-139 and upgraded to 144 before finding this post.
Is there any confirmation that this issue also occurs in 4.15.0-144?
I have have installed version 4.15.0-136 in the meantime to allow us to
reboot and select that kernel,
Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: linux (Ubuntu Bionic)
Status: New => Confirmed
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Hi Khaled,
I have finished testing the kernels - it took more time than I expected
but the results are:
4.15.0-136-generic: no issues
4.15.0-137-generic: disk performance issue
4.15.0-139-generic: disk performance issue
4.15.0-140-generic: disk performance issue
4.15.0-142-generic: disk
Thanks for the extensive testing, Mariusz. (I assume -137 doesn't have
the performance problem?)
So, for comment #9 - the difference in loaded modules comes down to 20
additional modules that were loaded when performance was bad:
-ip6_tables 28672 0
-iptable_filter 16384 0
-ip_tables 28672 1
Hi,
I have done longer testing of kernel 140 and it has performance
degradation issue as well. It took a couple of days to fully max out
disk IOs on that kernel with the same load. Therefore, I came back to
testing the other kernels in longer time-window.
At the moment, I'm running kernel
Hi,
In the last 3 days, I have been testing the other kernels. The steps
which I took:
1. Boot to kernel-4.15.0-136.
2. Install kernel X, where X = 136,137,139,140:
sudo apt-get install linux-image-4.15.0-X-generic
linux-headers-4.15.0-X-generic linux-modules-4.15.0-X-generic
Cool cool, I will try to do what you have suggested - that make sense.
Will get back once I have some details.
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Title:
Disk IO very slow on
Hi @Mariusz - thank you for the bug report. That certainly sounds like a
kernel bug based on your description.
Doing a kernel bisect is probably the fastest approach to identifying
the offending change. There are 392 changes between -136 and -142 so it
could take up to 9 tests for a full bisect.
** Also affects: linux (Ubuntu Bionic)
Importance: Undecided
Status: New
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Title:
Disk IO very slow on kernel 4.15.0-142-generic
To
Hi,
I have done another test and compared the same server running on
4.15.0-136-generic and kernel 4.15.0-142-generic. Collected zabbix CPU
utilization graph which is showing the problem from the performance
point of view. On 4.15.0-136-generic, the server works normal and there
are no processes
Unable to run apport-collect 1928744 command.
** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
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Title:
Disk IO very slow on
changed HWE to linux as I see no reference to a HWE (5.4) kernel
** Package changed: linux-signed-hwe (Ubuntu) => linux (Ubuntu)
** Tags added: bionic
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Thanks a lot for coming back to me. I couldn't run apport-collect as we
don't have python-launchpadlib installed. I did check (apt install
python3-launchpadlib) and in my case it would install quite a lot of
dependent packages - we would like to avoid that due to the nature of
our server.
But I
Thank you for taking the time to report this bug and helping to make
Ubuntu better. Please execute the following command only once, as it
will automatically gather debugging information, in a terminal:
apport-collect 1928744
When reporting bugs in the future please use apport by using 'ubuntu-
** Package changed: ubuntu => linux-signed-hwe (Ubuntu)
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Title:
Disk IO very slow on kernel 4.15.0-142-generic
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