Re: CPU Frequency Scaling and Niceness
On Mon, Apr 27, 2009 at 04:18:42PM -0400, Evan wrote: I just updated to from Intrepid to Jaunty, and I noticed something curious. I believe this is a bug, but even if it isn't, I thought it should be raised. If a cpu (or core) is set to Ondemand and an application with a high nice value is running: - In intrepid, the cpu remained scaled down - In jaunty the cpu scales up to 100% I found a website [1] which does a good job of explaining it, and I tried setting my ignore_nice_load to 1, but nice processes still scale the processor up. Unless I am mistaken, this is a bug. What information should I attach to the bug report? Why is it a bug? According to Matthew Garrett, to save power, you want to finish executing a task as soon as possible, which means running for a shorter time at 100% speed. http://mjg59.livejournal.com/88608.html Marius Gedminas -- Perl is not a programming language, it's a natural language that computers understand. Better than people, for the most part. -- Steve Simmons signature.asc Description: Digital signature -- Ubuntu-devel-discuss mailing list Ubuntu-devel-discuss@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-devel-discuss
Re: CPU Frequency Scaling and Niceness
On Tue, Apr 28, 2009 at 3:09 PM, Marius Gedminas mar...@pov.lt wrote: On Mon, Apr 27, 2009 at 04:18:42PM -0400, Evan wrote: I just updated to from Intrepid to Jaunty, and I noticed something curious. I believe this is a bug, but even if it isn't, I thought it should be raised. If a cpu (or core) is set to Ondemand and an application with a high nice value is running: - In intrepid, the cpu remained scaled down - In jaunty the cpu scales up to 100% I found a website [1] which does a good job of explaining it, and I tried setting my ignore_nice_load to 1, but nice processes still scale the processor up. Unless I am mistaken, this is a bug. What information should I attach to the bug report? Why is it a bug? According to Matthew Garrett, to save power, you want to finish executing a task as soon as possible, which means running for a shorter time at 100% speed. http://mjg59.livejournal.com/88608.html I understand that, however there are cases where restricting very nice processes is useful. My point is that it isn't doing something that it says it should do. That is, by definition, a bug. I have reported it at https://bugs.launchpad.net/ubuntu/+source/cpufreqd/+bug/368809 Evan -- Ubuntu-devel-discuss mailing list Ubuntu-devel-discuss@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-devel-discuss
CPU Frequency Scaling and Niceness
I just updated to from Intrepid to Jaunty, and I noticed something curious. I believe this is a bug, but even if it isn't, I thought it should be raised. If a cpu (or core) is set to Ondemand and an application with a high nice value is running: - In intrepid, the cpu remained scaled down - In jaunty the cpu scales up to 100% I found a website [1] which does a good job of explaining it, and I tried setting my ignore_nice_load to 1, but nice processes still scale the processor up. Unless I am mistaken, this is a bug. What information should I attach to the bug report? Evan [1] http://www.pantz.org/software/cpufreq/usingcpufreqonlinux.html -- Ubuntu-devel-discuss mailing list Ubuntu-devel-discuss@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-devel-discuss
Re: CPU Frequency Scaling and Niceness
Reposting to full list. Sorry Felipe. On Mon, Apr 27, 2009 at 5:05 PM, Felipe Figueiredo phils...@gmail.comwrote: Evan wrote: I just updated to from Intrepid to Jaunty, and I noticed something curious. I believe this is a bug, but even if it isn't, I thought it should be raised. If a cpu (or core) is set to Ondemand and an application with a high nice value is running: - In intrepid, the cpu remained scaled down - In jaunty the cpu scales up to 100% Why do you think it is a bug? I would guess the intrepid scaling governor was too strict instead. The nice behaviour AIUI is that the nice process is slowed/halted until the CPU is available, but as soon as it is, it should be used, shouldn't it? The bug is more that even when I set ignore_nice_load to 1 manually, it still doesn't do it. Unless there is something else which is supposed to be overriding that setting, this is a bug. -- Ubuntu-devel-discuss mailing list Ubuntu-devel-discuss@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-devel-discuss
