Date: Mon, 26 Nov 2001 18:34:18 -0700 From: Warner Losh <imp@harmony.village.org> To: Zwane Mwaikambo <zwane@linux.realnet.co.sz> Cc: freebsd-hackers@FreeBSD.ORG Subject: Re: [PATCH] Relevance of 8254 calibration. Message-ID: <200111270134.fAR1YIM08540@harmony.village.org> In-Reply-To: Your message of "Sun, 25 Nov 2001 11:54:23 %2B0200." <Pine.LNX.4.33.0111251151240.28188-100000@netfinity.realnet.co.sz> References: <Pine.LNX.4.33.0111251151240.28188-100000@netfinity.realnet.co.sz>
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In message <Pine.LNX.4.33.0111251151240.28188-100000@netfinity.realnet.co.sz> Zwane Mwaikambo writes: : I'd just like to know wether there are any i386 boxes which don't have a : timer_freq of 1193182Hz I know there might be slight variations but i : still have to come across a box that doesn't, which leads me to the : purpose of this email. Do we need to do the 8254 clock calibration? Yes. Almost *ALL* PCs in the field aren't exactly 11931282Hz. There's a lot of variance in this. PC have such crappy oscillators that calibration is required. The "slight" variation can be as large as +-300Hz, which is huge. :-(. But I'm a little biased here... Warner To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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