I have written a testcase to check for this problem but interestingly even with full data journaling disabled I'm still seeing heavy performance impacts on Ubuntu 14.04 dev. In the attachments is the testcase. Just execute it with "chrt -i 0 ionice -c 3 ./test.py" and while it is running do a few minutes something else with your computer to see the difference.
-- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/821610 Title: ionice doesn't nice the complete writing process Status in “linux” package in Ubuntu: Incomplete Bug description: I'm using Ubuntu 11.10 dev. I'm starting apache with the command "chrt -i 0 ionice -c 3 /usr/sbin/apache2ctl". On my system is full data journaling enabled. Theoretically if apache or a child process from apache is writing something to the disk it shouldn't affect any other applications like games because apache has the lowest cpu and I/O priority possible. But sometimes a child process from apache is writing a lot to my disk and I can't do much at this time anymore. If I play a game it is freezing every second and unplayable. If I disable full data journaling it is much better. This is why I think the [jdb2/sda1-8] process doesn't inherit the nice/ionice from the writing process. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/821610/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
