Date: Mon, 21 Nov 2005 10:17:55 -0500 From: <myfreebsd@cox.net> To: <Axel.Gruner@suedfactoring.de> Cc: freebsd-questions@freebsd.org Subject: RE:Load at 1.00 on SMP machine Message-ID: <20051121151913.LUFS14098.eastrmmtao05.cox.net@[172.18.52.8]>
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>i got a Problem on my dual XEON 3.06 GhZ machine, 2GB of >RAM, FreeBSD >5.4-STABLE. >I got "option SMP" in the kernel config and >"machdep.hlt_logical_cpus=1" in >/boot/loader.conf. >There are just 20 processes running (typical ones like >getty and stuff) and >the load of this machine is at 1.xx. There is no bgfsck and >other stuff. >So, i built a new kernel without "option SMP", rebooted, >and the load was >at 0.0x. But only one CPU was used (detected). >So, what could bei the Problem? >Well, the machine shows me 4 CPUs, HTT is not enabled via >/boot/loader.conf >and "machdep.hyperthreading_allowed". So, how to disable >HTT? Maybe this is >the problem of the high load? Why are you setting machdep.hlt_logical_cpus=1? My understanding, this would turn off one of the cpus. It should be set to 0 to have both cpus going. Also it is set in sysctl.conf not loader.conf, at least, that is how I have it. I am also curious how machdep.hyperthreading_allowed works. I run 6 so I believe it is turned on by default. Is this correct? Also if it is a solo cpu with HTT, do you need option SMP and machdep.hlt_logical_cpus=0 set or not with machdep.hyperthreading_allowed on? David
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