Re: Question about cpufreq governors
Hi Arjan :) * Arjan van de Ven <[EMAIL PROTECTED]> dixit: > On Fri, 2007-07-06 at 23:54 +0200, Jan Engelhardt wrote: > > On Jul 6 2007 22:50, DervishD wrote: > > > > > >What I want to know is if I can choose "ondemand" governor instead > > >of the recommended for AMD64, namely the "conservative" governor, since > > >I will be switching between those two frequencies. I haven't found any > > >information about my CPU regarding latency when switching between > > >frequencies, so I don't know if I will be gaining anything using the > > >"conservative" governor. > > > > > >Which governor is better suited for a CPU with only two fid's, > > >"ondemand" or "conservative"? > > > > Depends on what you want. ondemand instantly switches when there is > > something/nothing to do, while conservative uses a threshold (modeled upon > > latency). > > for power saving, the ondemand behavior is better in general. However if > you have a cpu that switches frequency very slowly, you may be better to > not go as high quickly because going back down is then burning more > power than needed potentially... That's the problem: I want to use "ondemand" but I don't know if it will work properly with my CPU because I don't know if my CPU switches frequency fast or slow :( I can find that information, although the Kconfig file for cpufreq says that AMD64 has latency problems (but I can confirm that, I'm afraid). Thanks for your answer :) Raúl Núñez de Arenas Coronado -- Linux Registered User 88736 | http://www.dervishd.net It's my PC and I'll cry if I want to... RAmen! - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: Question about cpufreq governors
Hi Jan :) * Jan Engelhardt <[EMAIL PROTECTED]> dixit: > On Jul 6 2007 22:50, DervishD wrote: > > > >What I want to know is if I can choose "ondemand" governor instead > >of the recommended for AMD64, namely the "conservative" governor, since > >I will be switching between those two frequencies. I haven't found any > >information about my CPU regarding latency when switching between > >frequencies, so I don't know if I will be gaining anything using the > >"conservative" governor. > > > >Which governor is better suited for a CPU with only two fid's, > >"ondemand" or "conservative"? > > Depends on what you want. ondemand instantly switches when there is > something/nothing to do, while conservative uses a threshold (modeled upon > latency). Yes, I know the difference, I'm afraid I didn't ask my question correctly O:). What I meant is that, since I don't know if my CPU has latency problems when switching from "slow" freq to "fast" freq, if I can use "ondemand" safely or if I must use "conservative" due to latency problems with my CPU. Thanks for your answer :) Raúl Núñez de Arenas Coronado -- Linux Registered User 88736 | http://www.dervishd.net It's my PC and I'll cry if I want to... RAmen! - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: Question about cpufreq governors
Hi Jan :) * Jan Engelhardt [EMAIL PROTECTED] dixit: On Jul 6 2007 22:50, DervishD wrote: What I want to know is if I can choose ondemand governor instead of the recommended for AMD64, namely the conservative governor, since I will be switching between those two frequencies. I haven't found any information about my CPU regarding latency when switching between frequencies, so I don't know if I will be gaining anything using the conservative governor. Which governor is better suited for a CPU with only two fid's, ondemand or conservative? Depends on what you want. ondemand instantly switches when there is something/nothing to do, while conservative uses a threshold (modeled upon latency). Yes, I know the difference, I'm afraid I didn't ask my question correctly O:). What I meant is that, since I don't know if my CPU has latency problems when switching from slow freq to fast freq, if I can use ondemand safely or if I must use conservative due to latency problems with my CPU. Thanks for your answer :) Raúl Núñez de Arenas Coronado -- Linux Registered User 88736 | http://www.dervishd.net It's my PC and I'll cry if I want to... RAmen! - To unsubscribe from this list: send the line unsubscribe linux-kernel in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: Question about cpufreq governors
Hi Arjan :) * Arjan van de Ven [EMAIL PROTECTED] dixit: On Fri, 2007-07-06 at 23:54 +0200, Jan Engelhardt wrote: On Jul 6 2007 22:50, DervishD wrote: What I want to know is if I can choose ondemand governor instead of the recommended for AMD64, namely the conservative governor, since I will be switching between those two frequencies. I haven't found any information about my CPU regarding latency when switching between frequencies, so I don't know if I will be gaining anything using the conservative governor. Which governor is better suited for a CPU with only two fid's, ondemand or conservative? Depends on what you want. ondemand instantly switches when there is something/nothing to do, while conservative uses a threshold (modeled upon latency). for power saving, the ondemand behavior is better in general. However if you have a cpu that switches frequency very slowly, you may be better to not go as high quickly because going back down is then burning more power than needed potentially... That's the problem: I want to use ondemand but I don't know if it will work properly with my CPU because I don't know if my CPU switches frequency fast or slow :( I can find that information, although the Kconfig file for cpufreq says that AMD64 has latency problems (but I can confirm that, I'm afraid). Thanks for your answer :) Raúl Núñez de Arenas Coronado -- Linux Registered User 88736 | http://www.dervishd.net It's my PC and I'll cry if I want to... RAmen! - To unsubscribe from this list: send the line unsubscribe linux-kernel in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: Question about cpufreq governors
On Fri, 2007-07-06 at 23:54 +0200, Jan Engelhardt wrote: > On Jul 6 2007 22:50, DervishD wrote: > > > >What I want to know is if I can choose "ondemand" governor instead > >of the recommended for AMD64, namely the "conservative" governor, since > >I will be switching between those two frequencies. I haven't found any > >information about my CPU regarding latency when switching between > >frequencies, so I don't know if I will be gaining anything using the > >"conservative" governor. > > > >Which governor is better suited for a CPU with only two fid's, > >"ondemand" or "conservative"? > > Depends on what you want. ondemand instantly switches when there is > something/nothing to do, while conservative uses a threshold (modeled upon > latency). for power saving, the ondemand behavior is better in general. However if you have a cpu that switches frequency very slowly, you may be better to not go as high quickly because going back down is then burning more power than needed potentially... - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: Question about cpufreq governors
On Jul 6 2007 22:50, DervishD wrote: > >What I want to know is if I can choose "ondemand" governor instead >of the recommended for AMD64, namely the "conservative" governor, since >I will be switching between those two frequencies. I haven't found any >information about my CPU regarding latency when switching between >frequencies, so I don't know if I will be gaining anything using the >"conservative" governor. > >Which governor is better suited for a CPU with only two fid's, >"ondemand" or "conservative"? Depends on what you want. ondemand instantly switches when there is something/nothing to do, while conservative uses a threshold (modeled upon latency). Jan -- - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Question about cpufreq governors
Hi all :) I have an AMD Athlon64, and according to "powernow-k8", it has to fid's, for 1000MHz and 1800MHz. I don't know if this is correct or if I should enable ACPI to have more fid's, but my question is not about this. What I want to know is if I can choose "ondemand" governor instead of the recommended for AMD64, namely the "conservative" governor, since I will be switching between those two frequencies. I haven't found any information about my CPU regarding latency when switching between frequencies, so I don't know if I will be gaining anything using the "conservative" governor. Which governor is better suited for a CPU with only two fid's, "ondemand" or "conservative"? Thanks a lot in advance :) Raúl Núñez de Arenas Coronado -- Linux Registered User 88736 | http://www.dervishd.net It's my PC and I'll cry if I want to... RAmen! - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Question about cpufreq governors
Hi all :) I have an AMD Athlon64, and according to powernow-k8, it has to fid's, for 1000MHz and 1800MHz. I don't know if this is correct or if I should enable ACPI to have more fid's, but my question is not about this. What I want to know is if I can choose ondemand governor instead of the recommended for AMD64, namely the conservative governor, since I will be switching between those two frequencies. I haven't found any information about my CPU regarding latency when switching between frequencies, so I don't know if I will be gaining anything using the conservative governor. Which governor is better suited for a CPU with only two fid's, ondemand or conservative? Thanks a lot in advance :) Raúl Núñez de Arenas Coronado -- Linux Registered User 88736 | http://www.dervishd.net It's my PC and I'll cry if I want to... RAmen! - To unsubscribe from this list: send the line unsubscribe linux-kernel in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: Question about cpufreq governors
On Jul 6 2007 22:50, DervishD wrote: What I want to know is if I can choose ondemand governor instead of the recommended for AMD64, namely the conservative governor, since I will be switching between those two frequencies. I haven't found any information about my CPU regarding latency when switching between frequencies, so I don't know if I will be gaining anything using the conservative governor. Which governor is better suited for a CPU with only two fid's, ondemand or conservative? Depends on what you want. ondemand instantly switches when there is something/nothing to do, while conservative uses a threshold (modeled upon latency). Jan -- - To unsubscribe from this list: send the line unsubscribe linux-kernel in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: Question about cpufreq governors
On Fri, 2007-07-06 at 23:54 +0200, Jan Engelhardt wrote: On Jul 6 2007 22:50, DervishD wrote: What I want to know is if I can choose ondemand governor instead of the recommended for AMD64, namely the conservative governor, since I will be switching between those two frequencies. I haven't found any information about my CPU regarding latency when switching between frequencies, so I don't know if I will be gaining anything using the conservative governor. Which governor is better suited for a CPU with only two fid's, ondemand or conservative? Depends on what you want. ondemand instantly switches when there is something/nothing to do, while conservative uses a threshold (modeled upon latency). for power saving, the ondemand behavior is better in general. However if you have a cpu that switches frequency very slowly, you may be better to not go as high quickly because going back down is then burning more power than needed potentially... - To unsubscribe from this list: send the line unsubscribe linux-kernel in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
