Intel *SM users, FYI, (and not 'on topic' strictly, but as the subject came up), anyone running Windows 2000 or below on HyperThreading enabled processors should, apparently, look into turning this off. Windows 2000 is not HyperThreading aware (Windows .Net Server and 2003 are, however), in that it does not know how to distinguish between physical and logical processors. In this way, it does not balance jobs across physical processors, only 'logical' ones. The worst case scenario here is where Win2K is loading its logical processors 1 and 2 to the max, but in reality this is only loading physical processor 1 = performance ouch. Licensing issues abound too, particularly where an app (or OS) is based on processor count.
>> http://www.microsoft.com/windows2000/docs/hyperthreading.doc Explains some of the detail, and there's lots more you'll see in a simple Google search, (there's talk in some fora about various Linux problems as well with certain kernel levels). I personally haven't benchmarked it, so can't comment on any performance particulars. Rgds, David McClelland Tivoli Storage Manager Certified Consultant Operations Backup and Recovery Projects Shared Infrastructure Development Reuters 85 Fleet Street London EC4P 4AJ -----Original Message----- From: ADSM: Dist Stor Manager [mailto:[EMAIL PROTECTED] On Behalf Of Jason Lee Sent: 10 November 2004 18:50 To: [EMAIL PROTECTED] Subject: Re: CPU Utilization Hi there, yes, we've disabled HT in the BIOS. Other boxes see "4" CPUS. Thanks jason On Nov 10, 2004, at 10:44 AM, Neil Schofield wrote: > Jason > > I've got to start by saying I know nothing about Linux so take this > with a pinch of salt but... > > The Generation 3 (& Generation 4?) DL380 has hyper-threading Intel > processors, so each physical processor appears as two virtual > processors. > Your dual processor system should therefore appear as a 4-way to the > operating system, unless you've disabled hyper-threading in the > hardware. > > I don't know whether there's anything you have to do to enable support > for hyper-threading in your version of Linux. > > Regards > Neil Schofield > Yorkshire Water Services Ltd. ----------------------------------------------------------------- Visit our Internet site at http://www.reuters.com Get closer to the financial markets with Reuters Messaging - for more information and to register, visit http://www.reuters.com/messaging Any views expressed in this message are those of the individual sender, except where the sender specifically states them to be the views of Reuters Ltd.