Am Sonntag 11 November 2007 schrieb Peter Humphrey: > On Saturday 10 Nov 2007, Bernhard Auzinger wrote: > > it's not a important question, but has anybody of you noticed when > > compiling certain packages the load on both cpu's is only about 50%. I > > have the feeling that it happens with packages that can not be split up > > into two jobs. But in this case one cpu should be on 100% load and the > > other one at ~0%. Maybe someone of you has a good explanation for this > > behaviour. > > I posted a question like this a few months ago, and I did a fair amount of > detective work. Pretty much inconclusive, I'm afraid, but it seemed to be > due to a motherboard chipset problem. This is a SuperMicro H8DCE; the > problem only appeared when this replaced a faulty MSI board. I think the > conversation ran in May, so you should be able to find it in the archive if > you're interested. > > (I'd noticed that the BOINC scheduler was trying to get two processes run > at full load, one on each CPU, but according to /top/ and /gkrellm/ each > was getting just 50%, sometimes one on each CPU and sometimes both on the > same one. And /top/ seemed confused about which CPU was running which > tasks!) > > I don't run BOINC any more, for other reasons, so I haven't run into the > problem recently. Kernel compilations seem to go OK, so it's all a bit of a > mystery. I concluded at the time: "I'm left with a vague feeling of > dissatisfaction from not knowing what's going on, and a suspicion that > something in the nForce2 chipset doesn't match what the kernel thinks. > Kernel versions seem not to affect this problem, at least not in the range > of versions I could find." > > -- > Rgds > Peter. > Linux Counter 5290, Aug 93
I don't think that it is a motherboard issue because I watched the same behaviour not only on my amd64X2 but also at work at a core2-duo and older pentium4's. I will try to find the thread from may. Thank you. Bernhard -- [EMAIL PROTECTED] mailing list
