Re: i386: Selectable Frequency of the Timer Interrupt

Hi,

>> >     HZ   ticks/jiffie  1 second      error (ppm)
>> > ---------------------------------------------------
>> >    100      11932      1.000015238      15.2

I was not quite able to reproduce these values, probably because I got the
math wrong. I used:
  $oneSecond = $ticksJiffie * $HZ / 1193182
which yields 11932*100/1193182 = 1.00001508571198693912, !=1.000015238
Math corrections welcome.

Anyway, I've done some graphs. Intersting that the smaller the HZ, the less
error (seen on a whole, esp. view_1k and view_8k.png) we get. 20Hz seems to
be the 0.0 case, and 18Hz is not bad either. IIRC, DOS used 18HZ ;)
http://jengelh.hopto.org/tick/




Jan Engelhardt
-- 
| Alphagate Systems, http://alphagate.hopto.org/

-
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/

---

• Follow-Ups:
  • Re: i386: Selectable Frequency of the Timer Interrupt
    • From: Vojtech Pavlik <[email protected]>

• References:
  • Re: [PATCH] i386: Selectable Frequency of the Timer Interrupt
    • From: George Anzinger <[email protected]>
  • Re: [PATCH] i386: Selectable Frequency of the Timer Interrupt
    • From: Vojtech Pavlik <[email protected]>
  • Re: [PATCH] i386: Selectable Frequency of the Timer Interrupt
    • From: Con Kolivas <[email protected]>
  • Re: [PATCH] i386: Selectable Frequency of the Timer Interrupt
    • From: Vojtech Pavlik <[email protected]>

• Prev by Date: Re: "scheduling while atomic" ?
• Next by Date: Re: "scheduling while atomic" ?
• Previous by thread: Re: [PATCH] i386: Selectable Frequency of the Timer Interrupt
• Next by thread: Re: i386: Selectable Frequency of the Timer Interrupt
• Index(es):
  • Date
  • Thread

[Index of Archives]     [Kernel Newbies]     [Netfilter]     [Bugtraq]     [Photo]     [Gimp]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Video 4 Linux]     [Linux for the blind]