In message <20090515.095406.-1739011364....@bsdimp.com>, "M. Warner Losh" write
s:
>When FreeBSD switched from gcc 3.x to gcc 4.x, I did measurements of
>the ability of the kernel to track a PPS (also changes with the major
>revision of the kernel). I found that there was no measurable
>difference between the different FreeBSD kernels I tested despite
>being built with a number of different compilers (3.4.5, 4.2.0 and
>4.1). It turns out that the algorithms for steering the time aren't
>dependent on how fast the results are computed, but rather dependent
>on the results being computed correctly. [...]
... which you can read more about in my paper from 2002:
http://phk.freebsd.dk/pubs/timecounter.pdf
Poul-Henning
--
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
p...@freebsd.org | TCP/IP since RFC 956
FreeBSD committer | BSD since 4.3-tahoe
Never attribute to malice what can adequately be explained by incompetence.
_______________________________________________
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
