Date: Thu, 11 Jul 2002 22:54:52 +0200 From: Thierry Herbelot <thierry@herbelot.com> To: Matthew Dillon <dillon@apollo.backplane.com> Cc: freebsd-stable@FreeBSD.ORG Subject: Re: tuning(7) request was: Re: Performance boost with kernel options in FBSD 4.6 Message-ID: <3D2DF09C.B553DE07@herbelot.com> References: <20020710104730.L10343-100000@klima.physik.uni-mainz.de> <04a601c228dc$c6dbb980$681663cf@icarz.com> <200207111930.g6BJUX5m096974@apollo.backplane.com>
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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 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message
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