On Mon, 26 Feb 2007 at 7:55am, Johnny Hughes wrote > On Mon, 2007-02-26 at 08:44 -0500, Joshua Baker-LePain wrote: >> On Mon, 26 Feb 2007 at 7:40am, Johnny Hughes wrote >> >>> OK ... is it a: >>> >>> Quad Processor (4 physical processors) Dual Core Xeon ... >>> >>> or >>> >>> Dual Processor (2 physical processors) Quad Core Xeon ... >>> >>> I have never heard if a "Quad Core" processor in production ... it might >>> be there, I could have missed it. >> >> E.g.: >> >> http://www.siliconmechanics.com/i8665/Quad-Core-Xeon.php >> >> In the CPU pull down menu you'll see both dual core and quad core Xeons. > > Someone what to send me some of those so I can test kernel modules on > them :P Heh. Be careful what you wish for. Keep in mind those 8 cores *still* share a single memory controller. In my testing, my Xeon 5160s are a *lot* better than the old P4 based Xeons at memory intensive code (i.e. they show contention less readily). But I do have some code that brings them to their knees when run across all 4 cores in a system (whereas dual core Opterons continue merrily along). Running said code across 8 cores with one path to memory would be painful. Things ought to get *real* interesting when AMD's quad cores come out... -- Joshua Baker-LePain Department of Biomedical Engineering Duke University