Public bug reported:
ubuntu 20.4
Linux eb850 5.4.0-62-generic #70-Ubuntu SMP Tue Jan 12 12:45:47 UTC 2021 x86_64
x86_64 x86_64 GNU/Linux
Simple copy big file:
janusz@eb850:~$ ls -al tmp.tar.gz
-rw-r--r-- 1 janusz janusz 3847997532 sty 24 20:09 tmp.tar.gz
janusz@eb850:~$ cp tmp.tar.gz tmp2.tar.gz
GUI apps became unresponsive - slack/teams/firefox ...
Top show all CPU (cores) ~100% usage in WA (io and kcryptd).
nvme0n1 259:0 0 465,8G 0 disk
├─nvme0n1p1 259:1 0 512M 0 part /boot/efi
├─nvme0n1p2 259:2 0 732M 0 part /boot
└─nvme0n1p3 259:3 0 464,6G 0 part
└─nvme0n1p3_crypt 253:0 0 464,6G 0 crypt
├─ubuntu--vg-root 253:1 0 463,6G 0 lvm /
└─ubuntu--vg-swap_1 253:2 0 980M 0 lvm [SWAP]
Is there any option that will change/tune kcryptd (dm-crypt) to not use all
cores?
Today any operation like cp/zip/unzip/git with large files, couse I can't use
ubuntu at all.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: Incomplete
** Tags: focal
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https://bugs.launchpad.net/bugs/1912960
Title:
kcryptd, big file copy, system became unresponsive
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