> I assume you are working on one of the small board form factor
> pentium 2 or up?
You assume correctly.
(Low-voltage Pentium 3 in a �ATX motherboard.)
Reply by Wulf●September 6, 20062006-09-06
On Tue, 05 Sep 2006 16:31:25 +0200, Spoon <root@127.0.0.1> wrote:
This may not be what you want but you might want to look at rtai
linux. It's basically a real time kernel with linux riding on top. I
assume you are working on one of the small board form factor pentium
2 or up?
Reply by Spoon●September 6, 20062006-09-06
Spoon wrote:
> I need to be able to put a process to sleep for 100-1000 microseconds
> (until now, I've been using a generic Linux kernel on a low-voltage x86
> CPU). AFAIU, the x86 platform comes with several timers[*] and I had
> hoped one of them would prove useful in my situation.
>
> [*] I tried to list all the timers in:
> http://groups.google.com/group/comp.arch/msg/6be4741f4f92be6
> (I found PIT, RTC, (L?)APIC timer, ACPI timer, HPET, TSC.)
>
> At some point, I was convinced that the simplest solution would be to
> purchase a PCI card with multiple Programmable Interval Timers, such as
> ADLINK's PCI-8554:
>
> http://www.adlinktech.com/PD/web/PD_detail.php?pid=27
>
> Then I ran into the relatively new hrtimers infrastructure[*] which
> seems to let me do what I need. (I'm not sure how, though.)
>
> [*] http://www.tglx.de/hrtimers.html
>
> I'm confused. It seems a generic Linux kernel can indeed provide
> high-resolution timers without any additionnal hardware.
>
> Then when is a card with multiple PITs needed? Have any of you ever been
> in a situation where software came up short, and the multiple PITs were
> mandatory? What are the typical uses of such a card?
Perhaps there is a more appropriate newsgroup for this query?
Reply by Spoon●September 5, 20062006-09-05
Hello,
I need to be able to put a process to sleep for 100-1000 microseconds
(until now, I've been using a generic Linux kernel on a low-voltage x86
CPU). AFAIU, the x86 platform comes with several timers[*] and I had
hoped one of them would prove useful in my situation.
[*] I tried to list all the timers in:
http://groups.google.com/group/comp.arch/msg/6be4741f4f92be6
(I found PIT, RTC, (L?)APIC timer, ACPI timer, HPET, TSC.)
At some point, I was convinced that the simplest solution would be to
purchase a PCI card with multiple Programmable Interval Timers, such as
ADLINK's PCI-8554:
http://www.adlinktech.com/PD/web/PD_detail.php?pid=27
Then I ran into the relatively new hrtimers infrastructure[*] which
seems to let me do what I need. (I'm not sure how, though.)
[*] http://www.tglx.de/hrtimers.html
I'm confused. It seems a generic Linux kernel can indeed provide
high-resolution timers without any additionnal hardware.
Then when is a card with multiple PITs needed? Have any of you ever been
in a situation where software came up short, and the multiple PITs were
mandatory? What are the typical uses of such a card?
Regards.