Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: util-linux (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1393335
Title:
fstrim slows down mixed ssd/hdd considerable
Status in util-linux package in Ubuntu:
Confirmed
Bug description:
I have a ssd/hdd system where the ssd is used for the system and most
of home is on a large hdd.
I noticed that the weekly fstrim cron job slows the system down considerable,
including e.g. firefox and
the desktop. iotop reports:
"""
otal DISK READ : 0.00 B/s | Total DISK WRITE : 0.00 B/s
Actual DISK READ: 0.00 B/s | Actual DISK WRITE: 7.71 K/s
TID PRIO USER DISK READ DISK WRITE SWAPIN IO> COMMAND
24504 be/4 root 0.00 B/s 0.00 B/s 0.00 % 99.99 % fstrim --all
"""
So hardly any real io activity but still massive slowdown with
3.16.0-24-generic.
E.g. a dpkg operation while fstrim is running:
"""
# time dpkg -i 2vcard_0.5-3_all.deb
real 0m8.221s
user 0m0.895s
sys 0m0.671s
# time dpkg -i 2vcard_0.5-3_all.deb
real 0m8.215s
user 0m0.895s
sys 0m0.705s
# killall fstrim
# time dpkg -i 2vcard_0.5-3_all.deb
real 0m2.023s
user 0m0.992s
sys 0m0.703s
# time dpkg -i 2vcard_0.5-3_all.deb
real 0m1.709s
user 0m0.958s
sys 0m0.738s
"""
This may of course be simply a kernel problem but I do get similar
result for both 3.16 and 3.13.
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