rychlejsi/presnejsi casovac v kernelu u redhat 8?

[Petr Stehlik]

On St, 2002-09-25 at 12:36, Petr Stehlik wrote:
> nekde (zrejme tady?) jsem zahledl zminku o tom, ze budto novy RedHat
> nebo Mandrake GNU/Linux bude mit upraveny 2.4.x kernel tak, ze snad na
> AMD procesorech bude presnejsi/rychlejsi casovac?

odpovidam si sam: nebylo to tady, ale na root.cz, nebyl to Mandrake, ale
RedHat, a informace jsou v RELEASE-NOTES na ftp.redhat.com v beta/null.

"* HZ=512 on i686 and Athlon means that the system clock ticks 5 times
as fast as on other x86 platforms (i386 and i586); HZ=100 has been the
Linux default on x86 platforms for the entire history of the Linux
kernel. This change provides better interactive response, lower latency
response from some programs, and better response from the scheduler. We
have adjusted the /proc file system to report numbers as if using the
default HZ=100, but it is possible that issues could arise -- please
test and report bugs as you encounter them."

Funguje nekdo s timto upravenym kernelem? Zajimalo by me, proc zvolili
512 a ne 500 - jak to tedka nejak rozumne podeli? A chapu to dobre, ze
se ted thready prepinaji casteji nez drive? Jak se vlastne casto u
normalniho linuxu prepinaji thready/procesy - 100x za sekundu? Nebo mene
casto? Ja bych kazdopadne potreboval alespon 200x za sekundu, takze
kdyby to u tohodle kernelu bylo 256 nebo 512, asi bych byl spokojen. Jen
aby pak nezacalo padat neco jineho - prece jen je to asi pekne kruta
zmena uvnitr kernelu.

Petr