Date: Mon, 02 Jul 2007 07:31:47 -0500 From: "Jack Stone" <antennex@hotmail.com> To: freebsd-questions@freebsd.org Subject: Re: kern.hz="100" stops high-pitched whine Message-ID: <BAY125-F3001869A4CBB8CAF4B378BCC0D0@phx.gbl> In-Reply-To: <4687B02B.7080106@mac.com>
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>From: Chuck Swiger <cswiger@mac.com> >To: cpghost <cpghost@cordula.ws> >CC: questions <freebsd-questions@freebsd.org> >Subject: Re: kern.hz="100" stops high-pitched whine >Date: Sun, 01 Jul 2007 09:46:19 -0400 > >cpghost wrote: >>Are there any reasons NOT changing kern.hz from the >>default 1000 back to 100? With my typical mix of >>desktop apps (EPIA) and networking / server (Soekris), >>everything seems to be running just as smoothly with >>100 Hz than with 1000 Hz (testing now for two weeks >>without problems). Even playing videos with mplayer >>on the EPIA doesn't look different in any way. >> >>Is it okay to stay with 100 Hz with this type of >>low-speed CPU/boards? Or are there some compelling >>reasons not to? > >Actually, many Unix systems ran with HZ=100 until a few years ago, about >when Gb ethernet and CPUs became common. A slower machine like the EPIA >boxes do quite well with HZ=100/200/250 or so...HZ=1000 is better if you >have a fast box running lots of concurrent processes, and/or are proxying >or routing network traffic where the difference between 10 ms and 1ms of >latency adds up and/or effects other systems. > >-- >-Chuck A while ago, I noticed someone's kernel config that included: hertz=2000 which made me wonder where this setting info comes from? I've been using hertz=1000 however, with my much faster boxes, is this appropriate now? Thanks, Jack _________________________________________________________________ PC Magazine’s 2007 editors’ choice for best Web mail—award-winning Windows Live Hotmail. http://imagine-windowslive.com/hotmail/?locale=en-us&ocid=TXT_TAGHM_migration_HM_mini_pcmag_0507
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