Date: Sun, 27 Apr 2003 23:17:14 +0300 From: "Petri Helenius" <pete@he.iki.fi> To: "Peter Wood" <peter@alastria.net>, <freebsd-smp@freebsd.org> Subject: Re: machdep.cpu_idle_hlt on a Dual AMD 2000+ MP Message-ID: <049101c30cf9$fedef340$932a40c1@PHE> References: <af8oav4h43rd549afuusneuo6qle7vjrnm@4ax.com>
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>I've change it to 1 on my dual machine, and so far it appears stable. I have >noticed that the CPU tempratures appear to be lower now, possibly a >coincidence as the servers load may have been changing. Should I expect it to >be lower? Yes, because instead of running full steam in busyloop, you´re stopping the CPU. >Also should I expect to see any performance loss, or instability? Does anyone >know the original reason for setting the defaults this way? If a process wakes up there might be a scheduling latency up to one HZ tick if you have HLT enabled on SMP. This is documented at least on the comments on the source. Pete
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