Hi, I looked into ionice && CFQ some time ago. The use of ionice didn't much help with the updatedb-run-and-system-gets-really-slow-to-interact- with problem.
To be really sure, if the 'ionice' command is the problem, I wrote a kprobe-module to check if the ionice value is present in the scheduler after a command is called by 'ionice' - and it was. Btw, if you start a command via 'nice', then the ionice-value of the called process is changed as well. Thus, calling a process with a very nice nice-value has the same effect as calling it with ionice. Using 'nice' for an already running command doesn't change the ionice- value in the scheduler. And btw, CFQ considers only file-reads. To sum it up: it looks like ionice is doing its job well - but the scheduler/kernel doesn't Best regards Georg -- slocate daily anacron job makes system feel slow https://bugs.launchpad.net/bugs/13671 You received this bug notification because you are a member of Ubuntu Bugs, which is a direct subscriber. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
