Re: [Freedos-user] Does FreeDOS make CPU sleep when idle?
Zbigniew B. wrote: I want to replace a DOS installation on quite old computer - it is 386SX25 - which I'm keeping around just because it's s.c. booksize PC. It has no ACPI, not even APM. I understand, that the FDAPM is most recommended method, but - from the other side - using this very old computer only the kernel built-in method will work? Am I right? It's very unlikely that a 386SX will overheat ever. No need to play around with IDLEHALT or FDAPM. Robert Riebisch -- BTTR Software http://www.bttr-software.de/ -- Colocation vs. Managed Hosting A question and answer guide to determining the best fit for your organization - today and in the future. http://p.sf.net/sfu/internap-sfd2d ___ Freedos-user mailing list Freedos-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/freedos-user
Re: [Freedos-user] Does FreeDOS make CPU sleep when idle?
On Sunday 13 of March 2011 at 10:20:51, Robert Riebisch wrote: It's very unlikely that a 386SX will overheat ever. No need to play around with IDLEHALT or FDAPM. Maybe. But it's still nice to lower the temperature of the chip, to make it last longer, and not warm up components that are around it. Plus, it's always a little more electricity saved. Running FDAPM costs nothing, and provides cool advantages. There's no reason to not use it. ;-) Best regards, Mateusz Viste signature.asc Description: This is a digitally signed message part. -- Colocation vs. Managed Hosting A question and answer guide to determining the best fit for your organization - today and in the future. http://p.sf.net/sfu/internap-sfd2d___ Freedos-user mailing list Freedos-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/freedos-user
Re: [Freedos-user] Does FreeDOS make CPU sleep when idle?
Hi! Yes! The good news is that newer FreeDOS kernels even have a simple version built into the kernel itself. [..] Good news! Well, I should have googling for FreeDOS idle CPU, instead of DOS idle CPU. ;) :-) However, the normal way to let the CPU idle while DOS is idle is to load a suitable driver or TSR. In MS DOS you would use POWER but in FreeDOS you use the similar FDAPM tool. To load and activate it, run FDAPM APMDOS That will work on any DOS hardware, but of course it makes more difference on more energy-hungry CPU. PS: You can also use FDAPM to ACPI throttle your CPU if your board supports that. [..] Probably only with Pentium II / AMD K6 and newer. But then 386s had a turbo button for the same ;-) I want to replace a DOS installation on quite old computer - it is 386SX25 - which I'm keeping around just because it's s.c. booksize Still nice to save some energy with little work :-) PC. It has no ACPI, not even APM. I understand, that the FDAPM is most recommended method, but - from the other side - using this very old computer only the kernel built-in method will work? Am I right? FDAPM automatically detects whether you have APM or ACPI support. On your computer, it will only set the CPU to halt (like the kernel idlehalt feature) but will do so more often than the kernel feature, as it turns more cases of busy wait into halt wait :-) Because you have no ACPI, the FDAPM SPEEDn (n = 1-9) function will have no effect so you cannot throttle. Also, because you have no PCI, the PCISLEEP tool is not available on your PC to do standby and suspend related things or show a list of extension cards. If you have ISA PnP extension cards - there is an Intel ISA PnP manager that you could download but it is a bit bloated in size and ISA does not have standby or suspend features anyway, just a config. Eric PS: Please mail if you find apps that need a 486+. Of course PCISLEEP / UIDE / UMBPCI would need PCI. -- Colocation vs. Managed Hosting A question and answer guide to determining the best fit for your organization - today and in the future. http://p.sf.net/sfu/internap-sfd2d ___ Freedos-user mailing list Freedos-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/freedos-user
Re: [Freedos-user] Does FreeDOS make CPU sleep when idle?
2011/3/13, Mateusz Viste: Maybe. But it's still nice to lower the temperature of the chip, to make it last longer, and not warm up components that are around it. Plus, it's always a little more electricity saved. Running FDAPM costs nothing, and provides cool advantages. There's no reason to not use it. ;-) Yes, it seems, that it'll work with 386SX too. Here's what I've found on cpuidle home page: Under normal circumstances the CPU isn't always active but spends much time waiting for the keyboard, harddisk or CD-ROM. What would be more logical than to turn off the CPU for that period? That's exactly what the HLT machine instruction (Opcode F4) does. Whenever the CPU encounters a HLT instruction the clock is halted and the CPU enters suspend mode until an interrupt, NMI, or reset happens. With the advent of power saving microprocessors like the Cyrix Cx486S the HLT instruction elicits an additional benefit. When `Suspend on HLT' is enabled in the configuration register the processor not only stops on HLT but also enters the power saving suspend mode. Of course, 386SX hasn't been designed as power saving microprocessor - but still, if HLT halts CPU clock, it's suggesting to me, that effectively CPU is turned off (until an interrupt happens). And since in DOS we've got no daemons running in background, even the HLT method alone can be quite effective method of cooling. -- Colocation vs. Managed Hosting A question and answer guide to determining the best fit for your organization - today and in the future. http://p.sf.net/sfu/internap-sfd2d ___ Freedos-user mailing list Freedos-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/freedos-user
[Freedos-user] Does FreeDOS make CPU sleep when idle?
I read, that the source of CPU (over)heating problems under original MS/PC-DOS was the fact, that its waiting for key-loop (or however it is called) didn't set CPU idle, when user (or application) was idle. For example: when the computer has been left with the cursor blinking in the command line. I'm wondering, whether this misfeature has been fixed in FreeDOS? -- Colocation vs. Managed Hosting A question and answer guide to determining the best fit for your organization - today and in the future. http://p.sf.net/sfu/internap-sfd2d ___ Freedos-user mailing list Freedos-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/freedos-user
Re: [Freedos-user] Does FreeDOS make CPU sleep when idle?
Hi! On 12.03.2011 21:44, Zbigniew B. wrote: I read, that the source of CPU (over)heating problems under original MS/PC-DOS was the fact, that its waiting for key-loop (or however it is called) didn't set CPU idle, when user (or application) was idle. You need a driver for that, it is not standard part of normal DOS. For example: when the computer has been left with the cursor blinking in the command line. I'm wondering, whether this misfeature has been fixed in FreeDOS? Yes! The good news is that newer FreeDOS kernels even have a simple version built into the kernel itself. You can activate it by putting IDLEHALT=1 in your (fd)config.sys file. The value 1 means normal, 0 means do not put the CPU to idle, 2 and 3 activate some Win3 related extensions. However, the normal way to let the CPU idle while DOS is idle is to load a suitable driver or TSR. In MS DOS you would use POWER but in FreeDOS you use the similar FDAPM tool. To load and activate it, run FDAPM APMDOS either at the command prompt or in your autoexec or similar :-) The FDAPM method needs only a bit of RAM and is more efficient than the simple method built into the kernel. Its best to activate only one. Regards, Eric PS: You can also use FDAPM to ACPI throttle your CPU if your board supports that. I once measured one board and found that throttling meant stop CPU during N of each 8 timeslices of 1/32768 second. Can be useful if your CPU is faster than needed, e.g. for games... -- Colocation vs. Managed Hosting A question and answer guide to determining the best fit for your organization - today and in the future. http://p.sf.net/sfu/internap-sfd2d ___ Freedos-user mailing list Freedos-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/freedos-user
Re: [Freedos-user] Does FreeDOS make CPU sleep when idle?
2011/3/12, Eric Auer: I'm wondering, whether this misfeature has been fixed in FreeDOS? Yes! The good news is that newer FreeDOS kernels even have a simple version built into the kernel itself. [..] Good news! Well, I should have googling for FreeDOS idle CPU, instead of DOS idle CPU. ;) However, the normal way to let the CPU idle while DOS is idle is to load a suitable driver or TSR. In MS DOS you would use POWER but in FreeDOS you use the similar FDAPM tool. To load and activate it, run FDAPM APMDOS either at the command prompt or in your autoexec or similar :-) The FDAPM method needs only a bit of RAM and is more efficient than the simple method built into the kernel. Its best to activate only one. [..] PS: You can also use FDAPM to ACPI throttle your CPU if your board supports that. [..] I want to replace a DOS installation on quite old computer - it is 386SX25 - which I'm keeping around just because it's s.c. booksize PC. It has no ACPI, not even APM. I understand, that the FDAPM is most recommended method, but - from the other side - using this very old computer only the kernel built-in method will work? Am I right? -- Colocation vs. Managed Hosting A question and answer guide to determining the best fit for your organization - today and in the future. http://p.sf.net/sfu/internap-sfd2d ___ Freedos-user mailing list Freedos-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/freedos-user
