Date: Mon, 21 Nov 2005 18:25:59 +0100 From: "Axel S. Gruner" <liste@encephalon.de> To: <myfreebsd@cox.net> <myfreebsd@cox.net> Cc: Axel.Gruner@suedfactoring.de, freebsd-questions@freebsd.org Subject: Re: Load at 1.00 on SMP machine Message-ID: <0C3B8745-29B5-42CA-8EAC-2F94A6F40570@encephalon.de> In-Reply-To: <20051121151913.LUFS14098.eastrmmtao05.cox.net@[172.18.52.8]> References: <20051121151913.LUFS14098.eastrmmtao05.cox.net@[172.18.52.8]>
next in thread | previous in thread | raw e-mail | index | archive | help
Hi, Am 21.11.2005 um 16:17 schrieb <myfreebsd@cox.net> <myfreebsd@cox.net>: >> 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. Both CPUs are working. Also, works with machdep in loader.conf. Thats not the problem. > 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? I do not know. I just want turn off HTT, but stay with SMP. So i want my two phyiscal CPUs working, but not the logical (HTT) one. This is because is think maybe the load of 1.0x comes from turning on HTT. Well, if i do not use SMP in the kernel, the load is fine, but there is just one of the physical CPUs working.
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?0C3B8745-29B5-42CA-8EAC-2F94A6F40570>