Matthew Dillon wrote:
>
> An increased switching rate (increasing HZ) may be useful in the above
> situation. Still, I would not recommend increasing Hz above 500 (2ms).
> 10000 (100uS) is just plain insane.
>
from actual experience, any p-III with a clock rate above 500MHz (that
is, any recent CPU) can sustain Hz=5000, which I used to run
trafific-shaped packet blasters (admittedly a narrow focus ...) with
very good results (better than special-purpose test boxes).
As is said in the dummynet man page, FreeBSD can be a very good traffic
shaper, if the userland scheduling rate is high enough (will it be the
same with threads in -current, with KSE ?).
many of my machines run with GENERIC and kern.hz=1000 in
/boot/loader.conf
(I still have to look if NTIMECOUNTER is upped in the same porportion :
USTL !)
TfH
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