Date: Mon, 02 Jul 2007 14:06:53 +0200 From: cpghost <cpghost@cordula.ws> To: Chuck Swiger <cswiger@mac.com> Cc: questions <freebsd-questions@freebsd.org> Subject: Re: kern.hz="100" stops high-pitched whine Message-ID: <4688EA5D.5010905@cordula.ws> In-Reply-To: <4687B02B.7080106@mac.com> References: <46878C1C.9040907@cordula.ws> <4687B02B.7080106@mac.com>
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Chuck Swiger wrote: > 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. > Ah, thank you! It definitely works very well here with HZ=100. :) Regards, -cpghost. -- Cordula's Web. http://www.cordula.ws/
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