Hi,
On Wed, 15 Feb 2006, Ulrich Windl wrote:
> > > Assuming 1024Hz interrupt frequency:
> > > (1µs * 1000) / 1024 == 0ns; 0 * 1024 == 0µs, not 1µs
> > > (2µs * 1000) / 1024 == 1ns; 1 * 1024 == 1.024µs, not 2µs
> >
> > Ok, I didn't put much effort into optimizing it for uncommon HZ values.
> > Why is it so important? It's currently unused on any Linux machine
> > synchronized via NTP.
>
> Roman,
>
> how do you know? When using "disable kernel", NTP relies on adjtime() to adjust
> the time. Some people even prefer that, because the algorithms do floating point
> math in user space instead of fixed-point maths in kernel space.
This still requires they choose an uncommon HZ value, which is not really
likely. Anyway, it's not really difficult to add the remainder to
time_adj_curr. Since the adjtime() has only a usec resolution and this
rounding error is only 1 usec, I didn't consider it to be that important.
bye, Roman
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Stuff]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
[Linux Resources]
