I experienced the same behaviour on
Operating System: Ubuntu 23.10
Kernel: Linux 6.5.0-15-generic
Architecture: x86-64 (Intel N100 4CPU)
And the following mount options:
//<nas ip>/paperless /share/smb/paperless cifs
credentials=/root/.smbcredentials,multichannel,iocharset=utf8 0 0
9 cifs mounts in total with the same options and a totally idle system
goes from 0 to 10 Load average
Nfs mounts are not producing this bug, it's strictly cifs related.
Before mounts:
cat /proc/loadavg
0.00 0.26 3.15 1/244 203137
After mounts:
cat /proc/loadavg
9.99 7.37 5.39 1/252 203256
That said all other metrics cpu/io/memory... are totally fine, just a
calculation bug I suppose.
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You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux-signed-hwe-6.5 in Ubuntu.
https://bugs.launchpad.net/bugs/2049242
Title:
CIFS Mounts Keep Load Average at n+1
Status in linux-signed-hwe-6.5 package in Ubuntu:
Confirmed
Bug description:
Today I noticed that my two primary Ubuntu boxes were running at high
load. After investigation, I discovered at that unmounting their CIFS
shares alleviating the high load.
I rebooted to the previous kernel, linux-modules-6.2.0-39-generic, and
saw that the load was low after everything had settled after startup.
I rebooted to the current kernel, linux-modules-6.5.0-14-generic, and
again saw the high load.
The load appears to be n+1, where n is the number of CIFS mounts.
(Based on a sample of two boxes.)
I confirmed that the default mount options (e.g. the ones not
specified in fstab) are the same between the two kernels.
This *might* also be slowing down external (USB disk access. I'm
still investigating that.
ProblemType: Bug
DistroRelease: Ubuntu 22.04
Package: linux-image-6.5.0-14-generic 6.5.0-14.14~22.04.1
ProcVersionSignature: Ubuntu 6.5.0-14.14~22.04.1-generic 6.5.3
Uname: Linux 6.5.0-14-generic x86_64
ApportVersion: 2.20.11-0ubuntu82.5
Architecture: amd64
CasperMD5CheckResult: unknown
CurrentDesktop: ubuntu:GNOME
Date: Fri Jan 12 19:47:25 2024
InstallationDate: Installed on 2020-10-01 (1198 days ago)
InstallationMedia: Ubuntu 20.04.1 LTS "Focal Fossa" - Release amd64 (20200731)
ProcEnviron:
TERM=xterm-256color
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=en_US.UTF-8
SHELL=/bin/bash
SourcePackage: linux-signed-hwe-6.5
UpgradeStatus: Upgraded to jammy on 2023-01-01 (376 days ago)
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