Date: Sun, 01 Jul 2007 09:46:19 -0400 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 Message-ID: <4687B02B.7080106@mac.com> In-Reply-To: <46878C1C.9040907@cordula.ws> References: <46878C1C.9040907@cordula.ws>
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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
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