** Summary changed:
- Bcache bypasse writeback on caching device with fragmentation
+ Bcache bypass writeback on caching device with fragmentation
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Ack !
I'll check with Launchpad team then, I think they would probably prefer
to wait for the -updates indeed.
Thanks again for your work dans Dan's.
Cheers,
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Hello Matthew, sorry for the lack of response.
I'll check with Launchpad people if we can justify a reboot of the
server soon and will keep you posted !
Regards,
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I tried to run the apport-collect on one of the server we can see the
issue on :
Waiting to hear from Launchpad about your decision...
*** Collecting problem information
The collected information can be sent to the developers to improve the
application. This might take a few minutes.
..d
Public bug reported:
Hello,
An upstream bug has been opened on the matter for quite some time now [0].
I can reproduce easily on our production compute node instance, which are
trusty host with xenial hwe kernels (4.15.0-101-generic).
However due to heavy backport and such, doing real tracing is
The testing of the new kernel looks very promising. We don't observe any
of the latency/IOwait we had before even with the btree_shrinker
enabled.
We'll give it a week probably, but having a backport of those patches
would be fantastic for sure.
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Thanks Matthew, we'll try this kernel tomorrow.
I tested it on an openstack instance, the only downside is that it
uninstalls the official 4.15.0-118-generic one.
Regards,
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Hi Mauricio,
The tests in [5][6] and [7] have been done with a 44GB memory VM.
This VM usually has 64GB of allocated memory.
The goal was to verify that the load of the whole btree in RAM was not
prevented (like in mca-reap -> down_write_trylock).
All this kernel stuff is rather new to me, so I
** Description changed:
Hello,
In short, we faced an issue with a huge IO wait on a bionic Ubuntu
4.15.0-118.119-generic kernel.
This is the full list of process and the kernel function they were stuck in
[0].
The main issue can probably be summarized by this perf reports
* first
** Description changed:
Hello,
In short, we faced an issue with a huge IO wait on a bionic Ubuntu
4.15.0-118.119-generic kernel.
This is the full list of process and the kernel function they were stuck in
[0].
The main issue can probably be summarized by this perf reports
* first
Hello Mauricio,
That was also one of the conclusion we reached yesterday.
I followed a wrong lead yesterday, after getting another more detailed
output with klockstat.
I'll update the description of the bug at the end, adding the bits I
found.
The system is not really having memory pressure but
** Description changed:
Hello,
In short, we faced an issue with a huge IO wait on a bionic Ubuntu
4.15.0-118.119-generic kernel.
This is the full list of process and the kernel function they were stuck in
[0].
The main issue can probably be summarized by this perf reports
* first
Here is a trace of the bcache event related lock in the kernel obtained
with some bpfcc-tools.
klockstat-bpfcc -c bch_ -i 5 -s 3
The trace has been run in parallel with the following command line
echo "Shrinker disabled: $(date)"; sleep 60; echo "Enabling shrinker:
$(date)"; echo 0 | sudo tee
/s
Actually we cannot be sure no. The server didn't have any metrics prior
to few days ago and the issue was already there.
It's worth nothing that few servers have this bcache configuration,
because the cache mode is configured as writethrough and the load is
pretty significant.
So no last "good" v
Public bug reported:
Hello,
In short, we faced an issue with a huge IO wait on a bionic Ubuntu
4.15.0-118.119-generic kernel.
This is the full list of process and the kernel function they were stuck in [2].
The main issue can probably be summarized by this perf reports
* first identify that th
apport information
** Attachment added: "UdevLog.txt"
https://bugs.launchpad.net/bugs/1873352/+attachment/5355748/+files/UdevLog.txt
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apport information
** Attachment added: "WifiSyslog.txt"
https://bugs.launchpad.net/bugs/1873352/+attachment/5355749/+files/WifiSyslog.txt
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apport information
** Attachment added: "UdevDb.txt"
https://bugs.launchpad.net/bugs/1873352/+attachment/5355747/+files/UdevDb.txt
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apport information
** Attachment added: "ProcEnviron.txt"
https://bugs.launchpad.net/bugs/1873352/+attachment/5355744/+files/ProcEnviron.txt
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apport information
** Attachment added: "ProcInterrupts.txt"
https://bugs.launchpad.net/bugs/1873352/+attachment/5355745/+files/ProcInterrupts.txt
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apport information
** Attachment added: "ProcCpuinfoMinimal.txt"
https://bugs.launchpad.net/bugs/1873352/+attachment/5355743/+files/ProcCpuinfoMinimal.txt
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apport information
** Attachment added: "ProcCpuinfo.txt"
https://bugs.launchpad.net/bugs/1873352/+attachment/5355742/+files/ProcCpuinfo.txt
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apport information
** Attachment added: "ProcModules.txt"
https://bugs.launchpad.net/bugs/1873352/+attachment/5355746/+files/ProcModules.txt
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apport information
** Attachment added: "Lspci.txt"
https://bugs.launchpad.net/bugs/1873352/+attachment/5355739/+files/Lspci.txt
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apport information
** Attachment added: "NonfreeKernelModules.txt"
https://bugs.launchpad.net/bugs/1873352/+attachment/5355741/+files/NonfreeKernelModules.txt
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apport information
** Attachment added: "BootDmesg.txt"
https://bugs.launchpad.net/bugs/1873352/+attachment/5355736/+files/BootDmesg.txt
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apport information
** Attachment added: "Lsusb.txt"
https://bugs.launchpad.net/bugs/1873352/+attachment/5355740/+files/Lsusb.txt
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apport information
** Attachment added: "CurrentDmesg.txt"
https://bugs.launchpad.net/bugs/1873352/+attachment/5355738/+files/CurrentDmesg.txt
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Public bug reported:
Hello,
We recently encountered an issue when trying to stop nova instances.
| Apr 16 09:35:10 ginzel kernel: [6925958.071665] unregister_netdevice:
waiting for tape3e33cb9-d6 to become free. Usage count = 2
When I try to stop manually the qemu process, it errors
"""
ballot@
apport information
** Attachment added: "CRDA.txt"
https://bugs.launchpad.net/bugs/1873352/+attachment/5355737/+files/CRDA.txt
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