Date: Thu, 13 Jan 2005 05:42:48 +0100 From: Anthony Atkielski <atkielski.anthony@wanadoo.fr> To: freebsd-questions@freebsd.org Subject: Re: Hyperthreading hurts 5.3? Message-ID: <1639395851.20050113054248@wanadoo.fr> In-Reply-To: <41e5f66d.7993a979.5903.0077@smtp.gmail.com> References: <786252184.20050113014354@wanadoo.fr> <41e5f66d.7993a979.5903.0077@smtp.gmail.com>
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Subhro writes: S> This *used* to be true. I am using a AMD64 3000+ and the idle S> temperature is 28C. The room temp is around 12-14C. After asking this S> kid to crunch FPs for over 16 hrs, the processor temperature rose to S> only 38C. I am not using any special cooling gears, just the stock S> heatsink fan combo that came with the box pack. The case temperature on my FreeBSD server runs at about 36° C with a room temperature of 25° C, and the 3.0 GHz Intel P4 processor is at about 44° and very nearly idle (0.5% busy). After running the processor at 100% for a few minutes, it gets up to 51° (I haven't tried the experiment beyond that, and the system is never 100% under normal conditions). There are seven fans (I'm not taking any chances): two that blow into the case over the disk drives, one that blows down onto the motherboard (directly over the CPU), and three that blow through and out of the power supply--plus the P4 CPU fan. They draw air through filters so they don't create that much movement, but I like the redundancy. My desktop running WinXP has an AMD Athlon 1800-something. The processor runs at about 59° and the case is at 29°; this case has only three fans, one in the PS, on inward fan on the case, and a tiny CPU fan over the processor. The arrangement of the MB is such that the CPU doesn't have a very clear airflow over it. The CPU fan has been replaced twice, as the first fans were sleeve bearings that failed almost immediately (I installed my own ball-bearing fan after that). The case fan was my own addition. On one occasion the CPU froze after the fan failed, but it did not seem to break. I don't know if this model of processor includes any protections. It would be nice if someone would design processors that did not require active cooling, as the need for a CPU fan to keep the system from self-destructing is a major weak point for the hardware. Thank goodness modern operating systems idle the processor when it's not in use. I shudder to think what it would be like under old versions of Windows (including Win9x) that just looped when idle. FreeBSD runs cool as a cucumber, even though it handles all my Web and mail and DNS and NTP traffic. Which reminds me: I'm still looking for a way to monitor system temperature at securelevel=3 on my FreeBSD system, so suggestions are welcome. Healthd is fine but it won't work at securelevel=3. -- Anthony
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