That is an excellent idea.
Before embarking on that endeavor I did a last control test which
involved deploying Bionic and then installing the Focal 5.4 kernel
packages, and lo and behold the system is still performant.
Redeploying Focal (with the Focal kernel obviously) makes it non-
performant again.
While still baffled by the roots of the issue I will mark this bug
Invalid for the kernel packages for now as there is obviously some
mischief somewhere else involved in the end result. Depending on what I
find the open status may or may not return.
Thank you for your support so far.
** Changed in: linux (Ubuntu)
Status: Confirmed => Invalid
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https://bugs.launchpad.net/bugs/1880943
Title:
[focal] disk I/O performance regression
Status in linux package in Ubuntu:
Invalid
Bug description:
Freshly deployed equal machines with flat disk layout as configured by
MAAS, performance governor changed from ondemand to performance.
Bionic (4.15.0-101-generic) fio ext4 on spinning rust:
Run status group 0 (all jobs):
WRITE: bw=1441MiB/s (1511MB/s), 1441MiB/s-1441MiB/s (1511MB/s-1511MB/s),
io=1267GiB (1360GB), run=900001-900001msec
Disk stats (read/write):
sda: ios=2/332092, merge=0/567, ticks=196/123698912, in_queue=123760992,
util=95.91%
Bionic (4.15.0-101-generic) fio ext4 on nvme:
Run status group 0 (all jobs):
WRITE: bw=2040MiB/s (2139MB/s), 2040MiB/s-2040MiB/s (2139MB/s-2139MB/s),
io=1793GiB (1925GB), run=900001-900001msec
Disk stats (read/write):
nvme0n1: ios=0/2617321, merge=0/465, ticks=0/233900784, in_queue=232549460,
util=78.97%
Focal (5.4.0-31-generic) fio ext4 on spinning rust:
Run status group 0 (all jobs):
WRITE: bw=108MiB/s (113MB/s), 108MiB/s-108MiB/s (113MB/s-113MB/s),
io=100GiB (107GB), run=947255-947255msec
Disk stats (read/write):
sda: ios=65/430942, merge=0/980, ticks=1655/5837146, in_queue=4898628,
util=48.75%
Focal (5.4.0-31-generic) fio ext4 on nvme:
status group 0 (all jobs):
WRITE: bw=361MiB/s (378MB/s), 361MiB/s-361MiB/s (378MB/s-378MB/s),
io=320GiB (344GB), run=907842-907842msec
Disk stats (read/write):
nvme0n1: ios=0/2847497, merge=0/382, ticks=0/236641266, in_queue=230690420,
util=78.95%
Freshly deployed equal machines with bcache as configured by MAAS,
performance governor changed from ondemand to performance.
Bionic (4.15.0-101-generic):
Run status group 0 (all jobs):
WRITE: bw=2080MiB/s (2181MB/s), 2080MiB/s-2080MiB/s (2181MB/s-2181MB/s),
io=1828GiB (1963GB), run=900052-900052msec
Disk stats (read/write):
bcache3: ios=0/53036, merge=0/0, ticks=0/15519188, in_queue=15522076,
util=91.81%, aggrios=0/212383, aggrmerge=0/402, aggrticks=0/59247094,
aggrin_queue=59256646, aggrutil=91.82%
nvme0n1: ios=0/7169, merge=0/397, ticks=0/0, in_queue=0, util=0.00%
sda: ios=0/417598, merge=0/407, ticks=0/118494188, in_queue=118513292,
util=91.82%
Bionic (5.3.0-53-generic):
Run status group 0 (all jobs):
WRITE: bw=2725MiB/s (2858MB/s), 2725MiB/s-2725MiB/s (2858MB/s-2858MB/s),
io=2395GiB (2572GB), run=900001-900001msec
Disk stats (read/write):
bcache3: ios=96/3955, merge=0/0, ticks=4/895876, in_queue=895880,
util=2.63%, aggrios=48/222087, aggrmerge=0/391, aggrticks=3/2730760,
aggrin_queue=2272248, aggrutil=90.56%
nvme0n1: ios=96/2755, merge=0/373, ticks=6/78, in_queue=8, util=1.12%
sda: ios=0/441420, merge=0/409, ticks=0/5461443, in_queue=4544488,
util=90.56%
Focal (5.4.0-31-generic):
Run status group 0 (all jobs):
WRITE: bw=117MiB/s (123MB/s), 117MiB/s-117MiB/s (123MB/s-123MB/s),
io=110GiB (118GB), run=959924-959924msec
Disk stats (read/write):
bcache3: ios=0/4061, merge=0/0, ticks=0/1571168, in_queue=1571168,
util=1.40%, aggrios=0/226807, aggrmerge=0/183, aggrticks=0/2816798,
aggrin_queue=2331594, aggrutil=52.79%
nvme0n1: ios=0/1474, merge=0/46, ticks=0/50, in_queue=0, util=0.53%
sda: ios=0/452140, merge=0/321, ticks=0/5633547, in_queue=4663188,
util=52.79%
; fio-seq-write.job for fiotest
[global]
name=fio-seq-write
filename=fio-seq-write
rw=write
bs=256K
direct=0
numjobs=1
time_based=1
runtime=900
[file1]
size=10G
ioengine=libaio
iodepth=16
ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: linux-image-5.4.0-31-generic 5.4.0-31.35
ProcVersionSignature: Ubuntu 5.4.0-31.35-generic 5.4.34
Uname: Linux 5.4.0-31-generic x86_64
AlsaDevices:
total 0
crw-rw---- 1 root audio 116, 1 May 27 11:52 seq
crw-rw---- 1 root audio 116, 33 May 27 11:52 timer
AplayDevices: Error: [Errno 2] No such file or directory: 'aplay'
ApportVersion: 2.20.11-0ubuntu27
Architecture: amd64
ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord'
AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq',
'/dev/snd/timer'] failed with exit code 1:
CasperMD5CheckResult: skip
Date: Wed May 27 12:44:10 2020
IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig'
Lsusb:
Bus 002 Device 002: ID 8087:8002 Intel Corp.
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 003: ID 413c:a001 Dell Computer Corp. Hub
Bus 001 Device 002: ID 8087:800a Intel Corp.
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Lsusb-t:
/: Bus 02.Port 1: Dev 1, Class=root_hub, Driver=ehci-pci/2p, 480M
|__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/8p, 480M
/: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=ehci-pci/2p, 480M
|__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/6p, 480M
|__ Port 6: Dev 3, If 0, Class=Hub, Driver=hub/6p, 480M
MachineType: Dell Inc. PowerEdge R630
PciMultimedia:
ProcFB: 0 mgag200drmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.4.0-31-generic
root=UUID=8dd6086f-e616-466d-a424-e5556fd75045 ro intel_iommu=on iommu=pt
probe_vf=0
RelatedPackageVersions:
linux-restricted-modules-5.4.0-31-generic N/A
linux-backports-modules-5.4.0-31-generic N/A
linux-firmware 1.187
RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 11/08/2016
dmi.bios.vendor: Dell Inc.
dmi.bios.version: 2.3.4
dmi.board.name: 02C2CP
dmi.board.vendor: Dell Inc.
dmi.board.version: A03
dmi.chassis.type: 23
dmi.chassis.vendor: Dell Inc.
dmi.modalias:
dmi:bvnDellInc.:bvr2.3.4:bd11/08/2016:svnDellInc.:pnPowerEdgeR630:pvr:rvnDellInc.:rn02C2CP:rvrA03:cvnDellInc.:ct23:cvr:
dmi.product.name: PowerEdge R630
dmi.product.sku: SKU=NotProvided;ModelName=PowerEdge R630
dmi.sys.vendor: Dell Inc.
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