Date: Thu, 30 Dec 1999 22:27:02 -0800 From: Mike Smith <msmith@freebsd.org> To: tsikora@powerusersbbs.com Cc: "freebsd-stable@FreeBSD.ORG" <freebsd-stable@FreeBSD.ORG> Subject: Re: Temperature Findings Message-ID: <199912310627.WAA00576@mass.cdrom.com> In-Reply-To: Your message of "Thu, 30 Dec 1999 19:20:26 EST." <386BF6CA.EA00DF5C@home.com>
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> I had one my technicians set up a scope to test the voltage readings and > a Cooper temperature gauge to check the case temp. We decided to abandon > the CPU test since we had no accurate way to attach the gauge. Our > findings: > The voltage readings by the winbond IC in the bios are accurate. > The case temperature was 5F cooler than reported. > So I would conclude the readings from the bios are a fairly accurate > representation of the machines current condition. > > Things I failed to mention. > The CPU's were overclocked by 100MHz > Core CPU Voltage was raised a 1/2 step to 2.05V > > o This still does not explain the differences between Linux > and FreeBSD. The difference has already been explained as a different instruction mix. This should be obvious to anyone that has been in the industry for as long as you have. > o The standard 3.3-RELEASE UniProcessor kernel runs identical to > Linux. This is because both systems use the HLT instruction, which has a low power consumption. You've already been told this. > o FreeBSD SMP kernels immediately run hotter than the standard > kernel. FreeBSD doesn't use HLT in the SMP implementation. You've been told this as well. > I put Core voltage back to normal and set the CPU's to standard > settings. The result was much better but it still runs about 14 degrees > hotter.(acceptable) 26 degrees was not. > > Has anyone else checked this. Just checking the Generic versus a SMP > kernel you should see this. This is commonly known behaviour. Your problem is simply that your cooling setup is not adequate to support your system running at 100% duty cycle. You've been told this already. You need to upgrade your cooling arrangements, and you've been told _that_ already too. -- \\ Give a man a fish, and you feed him for a day. \\ Mike Smith \\ Tell him he should learn how to fish himself, \\ msmith@freebsd.org \\ and he'll hate you for a lifetime. \\ msmith@cdrom.com To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message
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