Confirmed mitigations=off gets things down to 18s in production
environment. I suppose there is still the outstanding question of why
the same python binary is 40% slower on ubuntu24 than ubuntu21, but at
least it isn't 6 times slower or worse.
** Changed in: linux (Ubuntu)
Status: New =>
Looking at the patch between 5.15.0-43-generic and 5.15.0-46-generic, I
saw that some mitigations were introduced. Even though my colleague
indicated he had already determined that mitigations=off did not help, I
decided it was worth double checking.
Using mitigations=off with today's daily serve
The above attachments were collected on a ubuntu20 install booting the
latest hwe kernel. In retrospect, that is probably confusing since the
title of this bug is about ubuntu22. ubuntu 24 server LTS is what I
actually care about. I am happy to gather those attachments on any
OS/kernel combinati
apport information
** Attachment added: "acpidump.txt"
https://bugs.launchpad.net/bugs/2083077/+attachment/5824240/+files/acpidump.txt
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** Attachment added: "WifiSyslog.txt"
https://bugs.launchpad.net/bugs/2083077/+attachment/5824239/+files/WifiSyslog.txt
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** Attachment added: "UdevDb.txt"
https://bugs.launchpad.net/bugs/2083077/+attachment/5824238/+files/UdevDb.txt
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** Attachment added: "ProcInterrupts.txt"
https://bugs.launchpad.net/bugs/2083077/+attachment/5824236/+files/ProcInterrupts.txt
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** Attachment added: "ProcModules.txt"
https://bugs.launchpad.net/bugs/2083077/+attachment/5824237/+files/ProcModules.txt
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** Attachment added: "ProcCpuinfoMinimal.txt"
https://bugs.launchpad.net/bugs/2083077/+attachment/5824235/+files/ProcCpuinfoMinimal.txt
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** Attachment added: "Lsusb-v.txt"
https://bugs.launchpad.net/bugs/2083077/+attachment/5824234/+files/Lsusb-v.txt
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** Attachment added: "Lsusb-t.txt"
https://bugs.launchpad.net/bugs/2083077/+attachment/5824233/+files/Lsusb-t.txt
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** Attachment added: "Lspci-vt.txt"
https://bugs.launchpad.net/bugs/2083077/+attachment/5824232/+files/Lspci-vt.txt
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** Attachment added: "CurrentDmesg.txt"
https://bugs.launchpad.net/bugs/2083077/+attachment/5824230/+files/CurrentDmesg.txt
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** Attachment added: "Lspci.txt"
https://bugs.launchpad.net/bugs/2083077/+attachment/5824231/+files/Lspci.txt
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** Tags added: apport-collected focal uec-images
** Description changed:
I suspect this is a kernel bug.
With ubuntu <= 21, I find that this runs in about 13 seconds:
python3 -c "import timeit; print(timeit.Timer('for _ in range(0,1000):
pass').timeit())"
Wi
More data points:
RHEL9 (kernel 5.14.0) w/ HT: 22s
RHEL9 (kernel 5.14.0) w/o HT: 22s
Slackware (kernel 5.15.161) w/ HT: 155s
Slackware (kernel 5.15.161) w/o HT: 22s
ubuntu20 (kernel 5.4.0-196-generic) w/ HT: 14s
ubuntu20 (UPGRADED kernel 5.11.0-22-generic) w/ HT: 19s
ubuntu20 (UPGRADED kernel 5.13
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