** Description changed: 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 + 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 + # 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 + # 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 + # 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 + # 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. + This may of course be simply a kernel problem but I do get similar + result for both 3.16 and 3.13.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1393335 Title: fstrim slows down mixed ssd/hdd considerable To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/util-linux/+bug/1393335/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
